UART

UART BLK11. What is used for asynchronous transmission of serial data between a DTE and a DCE?a. b. UARTc. USRTd. QARTe. CPU2. 3. It's a physical memory location in the CPU that allows quick data manipulation.a. b. Buffer register c. Internal registersd. Control registere. Transmit buffer register4. 5. What is used to buffer outgoing characters?a. b. Buffer register c. Internal registerd. Transmit buffer registere. Control register6. 7. It holds the contents of the memory which are to be transferred from memory to other components.a. b. Buffer registers c. Internal registerd. Transmit buffer registere. Control register8. 9. It is a processor register which changes or controls the general behavior of a CPU or other digital device.a. b. Buffer registers c. Internal registerd. Transmit buffer registere. Control register10. 11. It is an n-bit data registers that keeps track of the status of the UART's transmit and receive buffer registers.a. b. Buffer registers c. Status registerd. Transmit buffer registere. Control register12. 13. The only bit in the UART that is not optional or programmable.a. b. Stop bitc. Parity bitd. Start bite. Bit rate14. 15. 16. Status condition where transmit shift register has completed transmission of a data character.a. b. RPE (receive parity error)c. TBMT (transmit buffer empty)d. RFE (receive framing error)e. ROR (receive overrun)17. 18. Status condition that is set when a received character has a parity error in it.a. b. RPE (receive parity error)c. TBMT (transmit buffer empty)d. RFE (receive framing error)e. ROR (receive overrun)19. 20. Status condition that is set when a character is received without any or with an improper number of start bits.a. b. RPE (receive parity error)c. TBMT (transmit buffer empty)d. RFE (receive framing error)e. ROR (receive overrun)21. 22. Status condition that is set when a character in the receive buffer register is written over by another receive character because the CPU failed to service an active condition on REA before the next character has been received from receive shift register.a. b. RPE (receive parity error)c. TBMT (transmit buffer empty)d. RFE (receive framing error)e. ROR (receive overrun)23. 24. Status condition where a data character has been received and loaded into the receive data register.a. b. RPE (receive parity error)c. RDA (receive data available)d. RFE (receive framing error)e. ROR (receive overrun)25. 26. It is the fundamental method of conversion between serial and parallel forms.a. b. Shift registerc. Transmitterd. Modulatione. Receiver27. 28. The difference in time between the beginning of a start bit and when it is detected.a. b. Parity errorc. Bit error rated. Detection errore. Probability error29. 30. It is the difference in the arrival time between two sequentially-adjacent registers.a. b. Clock ratec. Clock skewd. Clock differencee. Clock block31. 32. What is used for synchronous transmission of serial data between a DTE and a DCE?a. b. UARTc. USRTd. QARTe. CPU33.

17. Any binary digital device that generates, transmits, receives, or interprets data messages.a. b. DCE c. DOEd. DTE e. DRE18. 19. It is a general term used to describe equipment that interfaces data terminal equipment to a transmission channel.a. b. DCEc. DOEd. DTE e. DRE20. 21. The maximum character length in UART is __________.a. b. 8 bitsc. 9 bitsd. 10 bits e. 11 bits22. 23. Using a 22-bit character format with ASCII encoding is called __________.a. b. Full ARQc. Full Baudotd. Full ASCIIe. Full QAM1.

UART BLK21. UART stands for

1. Universal Asynchronous Receiving Transmission1. United Asynchronous Receiver Transmission1. Universal Asynchronous Receiver/Transmitter1. Universal Asynchronous Receiver/Transmission

1. This are the primary functions of UART except

1. Error Detection by inserting parity bits in the transmitter 1. Insert start and stop bits in the transmitter1. Provide transmit and receive status information to the CPU1. None of the above

1. _________ transmit shift register has compledted transmission of a data character

1. Receive Parity Error1. Receive Framing Error1. Receiver Overrun1. Transmit Buffer Empty

1. Set when a received character has a parity error in it

a. Receive Parity Errorb. Receive Framing Errorc. Transmit Buffer Emptyd. Receiver Overrun

1. It is an n-bit data register that keeps track of the status of the UARTs transmit and receive buffer registers.

5. Transmit Buffer Empty5. Status Word Register5. Status word Receiver5. None of the above

1. A data character has been reived and loaded into the receive data register

1. Receive Data available1. Receive Framing Error1. Transmit Buffer Empty1. Receiver Overrun

1. TEOC stands for

7. Transmit end-of-character7. Transmitter end-of-character7. Transmit end-of-code7. None of the above

1. 1. What are the two functional sections of UART

9. Transmitter and Receiver9. Transmit end-of-character and Receiver Overrun9. Status Word Register and Status word Receiver9. Transmission and Receiver

1. It is used to detect valid start bits, which indicate the beginning of a data character

10. Start Bit Verification Circuit10. Start Buffer Verification Central10. Start Buffer Verification Circuit10. Start Bit Verification Central

1. 1. What is the used for asynchronous transmission of serial data between a DTE and DCE

12. RFE12. USRT12. UART12. RDA

1. It is set when a received character has a parity error in it

13. RFE13. RPE13. ROR13. TBMT

1. USRT stands for

14. United states of Ralph Thomas14. Universal Service Radio Transmitter14. Universal Synchronous Receiver/Transmitter14. Universal Synchronize Receiver/Transmitter

1. It is sometimes called clock skew

15. Clock slip page15. Clock slip data15. Click slip page15. Click slip cycle1. 1. It is used to buffer outgoing characters

17. Transmit buffer register17. Buffer register17. Shift register17. University Register1. 1. The difference in the arrival time between two sequentially-adjacent registers

19. Clock pulse19. Clock skew19. Clock screw19. Clock rate1. 1. TDS stands for

21. Time Domain Synchronous21. Transmit Data strobe21. Transmit domain System21. Transmit Data Server1. 1. It is the difference in time between the beginning of a start bit and when it is detected

23. Parity error23. Correction Error23. Detection Error23. Clock rate error1. 1. It is often called a FEP because it processes information and serves as an interface between the host computer and all the data communications circuit its serves

25. FEP25. USRT25. DCE25. DTE

1. It is a general term used to describe equipment that interfaces data terminal equipment to a transmission channel such as a digital TI carrier or an analog telephone circuit.

26. DCE26. DTE26. USRT26. FEP1. 1. It is a signal conversion device, as I converts signals from a DTE to a form more suitable to be transported over a transmission channel.

28. DCE28. DTE28. USRT28. DCTE

SERIAL INTERFACES BLK11. Which of the following must a serial interface provide?a. A specific range of voltages for transmit and receive signal levelsb. Limitations for the electrical parameters of the transmission linec. Standard cable and cable connectionsd. All of the above2. It is sometimes referred to as the EIZ-232 standard Versions C and E of the RS-232 standard.a. b. RS-232Ac. RS-232Bd. RS-232Ce. RS-232D3. 4. It is designed for transporting asynchronous data between a DTE and a DCE or between DTEs.a. b. 9-pin Version of RS-232c. 10-pin Version of RS-232d. 11-pin Version of RS-232e. 12-pin Version of RS-2325. 6. It is designed for transporting either synchronous or asynchronous data between a DTE and a DCE.a. b. 24 pin Versionc. 25 pin Versiond. 26 pin Versione. 25 pin Version7. 8. It is designed for dial-up telephone.a. b. EIA-560c. EIA-561d. EIA-562e. EIA-5639. 10. It converts the internal voltage levels from the DTE and DCE to RS-232 values.a. b. Voltage-Leveling Circuitsc. Driverd. Terminatore. RS

11. It means Recommended Standards.a. b. Voltage-Leveling Circuitsc. Driverd. Terminatore. RS12. 13. A voltage leveler wherein its output signals onto the cable.a. b. Voltage-Leveling Circuitsc. Driverd. Terminatore. RS14. 15. It accepts signals from the cable.a. b. Voltage-Leveling Circuitsc. Driverd. Terminatore. RS16. 17. The RS-449 has a total of __________.a. b. 46 pinsc. 47 pinsd. 48 pinse. 49 pins18. 19. Two categories of RS-449 Serial Interface.a. b. Category A and Category Bc. Category I and Category IId. Category C and Category De. Category 1 and Category 220. 21. One of the 10 circuits in RS-449 used by the DTE to request a local loopback from the DCE.a. b. Local Loopbackc. Remote Loopbackd. Select Frequencye. Test Mode22. 23. One of the 10 circuits in RS-449 used by the DTE to request a remote loopback from the distant DCE.a. b. Local Loopbackc. Remote Loopbackd. Select Frequencye. Test Mode24. 25. One of the 10 circuits in RS-449 allows the DTE to select the DCEs transmit and receive frequencies.a. b. Local Loopbackc. Remote Loopbackd. Select Frequencye. Test Mode26. 27. One of the 10 circuits in RS-449 used by the DTE to signal the DCE that a test is in progressa. b. Local Loopbackc. Remote Loopbackd. Select Frequencye. Test Mode28. 29. One of the 10 circuits in RS-449 common return wire for unbalanced signals propagating from the DCE to the DTE.a. b. Terminal in Servicec. Receive Commond. Select Standbye. New Signal30. 31. One of the 10 circuits in RS-449 used by the DTE to signal the DCE whether it is operational.a. b. Terminal in Servicec. Receive Commond. Select Standbye. New Signal32. 33. One of the 10 circuits in RS-449 used by the DTE to request that the DCE switched to standby equipment.a. b. Terminal in Servicec. Receive Commond. Select Standbye. New Signal34. 35. One of the 10 circuits in RS-449 used with a modem at the primary location of a multipoint data circuit.a. b. Terminal in Servicec. Receive Commond. Select Standbye. New Signal36. 37. It was intended to operate at data rates between 20kbps and 2Mbps using the same DB25 connector.a. b. RS-232c. RS-233d. RS-449e. RS-530

SERIAL INTERFACES BLK21. EIA stands for:

0. Electronics Industry Association0. Electronics Industries Association0. Electronic Industry Association0. Electronic Industries Association

1. RS stands for:

1. recommended standard1. recommended specifications1. required standard1. required specification

1. Ground Pins are:

2. 15,17,242. 20,222. 2,3,14,162. 1,7

1. Coordinates the flow of data, control signals and timing information between DTE and DCE.

3. driver3. terminator3. serial interface3. EIA1. 1. Data Pins are:

5. 15,17,245. 20,225. 2,3,14,165. 1,71. 1. Difference in the voltage levels between driver output and terminator input

7. noise margin7. NRZ-L7. voltage levelling circuit7. none of the above

1. Unassigned pin and is often designated as equalizer mode

8. 118. 108. 98. 81. 1. Pin known as the secondary receive line signal detect

10. 510. 610. 1110. 121. 1. Pin known as the ring indicator

12. 2112. 2212. 2312. 24

1. Pin known as clear to send

13. 513. 613. 713. 81. 1. Accepts signal from the cable

15. noise margin15. NRZ-L15. driver15. terminator1. 1. Convert the internal voltage levels from DTE and DCE to RS-232 values

17. noise margin17. NRZ-L17. voltage levelling circuit17. none of the above

1. Outputs the signal onto the cable

18. noise margin18. NRZ-L18. driver18. terminator

1. What ere the unassigned pins of RS-232

19. 9,10,11,18,2519. 1,4,7,9,2219. 9,10,11,19,2519. 13,12,23,24,251. 1. Official name of RS-23221. Interface Between DTE and DCE Employing Serial Binary Data Interchange21. Interface Between DCE and DTE Employing Serial Binary Data Interchange21. Interface Between DTE and DCE Employing Binary Serial Data Interchange21. Interface Between DCE and DTE Employing Binary Serial Data Interchange1. RS-232 is designed for serial transmission upto

22. 25kbps22. 10kbps22. 20kbps22. 30kbps

1. It is the special PC nine-pin version of RS-232

23. BD9S/P23. DB9S/P23. EIA-56123. EIA-5621. 1. How many pins do EIA-561 has?

25. 925. 2525. 725. 81. 1. This is where information terminates or originates

27. DCE27. RS-23227. DTE27. UART1. 1. Pin known as protective ground

29. 329. 429. 129. 21. 1. The transmission rate of an RS-232 signal is about.1. 1. 1000 bpsc. 100 bps1. 2000 bpsd. 200 bps1. In a typical asynchronous data transmission over an RS-232 interface, the delay time of a modem RTS-CTS is1. 100 msc. 5 ms1. 50 msd. 10 ms1. A serial interface standard which has 37 pins and has exceeded the capabilities and intended a replacement of an RS-232 interface33. RS449c. RS43033. RS530d. RS339

1. A function of RS449 interface which allows the DTE to select the DCEs transmit and receive frequency34. Local loopback c. remote loopback34. Select freqd. receive common1. A function of RS449 interface which used by the DTE to request a remote (digital)loopback from the distant DCE35. Local loopback c. remote loopback35. Select freq d. receive common1. A function of RS449 interface which used by the DTE to signal the DCE that a test is in progress36. Local loopback c. test standby36. Select freq d. test mode1. An interface which operates at data rates between 20kbps and 2mbps using the same 25-pin DB-25 connector used by the RS232 interface37. RS449c. RS43037. RS530d. RS3391. The following are the primary goals of an RS449 serial interface except38. Compatibility with the RS232 interface standard38. Specify a standard connector38. Offer higher data transmission rates38. Offer longer distances over coaxial cable wires1. This interface standard specifies a balance interface cable capable of operating up to 10Mbps and span distances up to 1200meters. 39. RS449-Ac. RS232-A39. RS449-Bd. RS232-B1. The modem training sequence time of an RS232 interface is about40. 100 msc. 5 ms40. 50 msd. 10 ms1. The modem RLSD turn-off delay time of an RS232 interface is about41. 100 msc. 5 ms41. 50 msd. 10 ms1. The propagation time of an RS232 interface is about42. 100 msc. 5 ms42. 50 msd. 10 ms1. The DTE primary data message length of an RS232 interface is about43. 100 msc. 5 ms43. 50 msd. 10 ms1. The function of the first pin of an RS232 serial interface is44. Chassis groundc. transmit delay44. Earth groundd. receive delay1. A serial interface that has 25 pins and uses an asynchronous data transmission45. RS449c. RS43045. RS232d. RS3391. An association which introduces the RS232, RS449 and RS530 serial interfaces46. ARPAc. EIA46. ANSId. IEEE1. In a 37 pin RS449 serial interface, which of the following pin has exactly no function? 47. 37c. 3847. 36d. 391. The EIA produces a serial interface standard for automatic calling units48. RS446c. RS44948. RS336d. RS3391. The major difference of an RS232 and RS449 serial interface is49. Separation of primary data c. both a and b49. Secondary diagnostic two channels d. none of the choices1. Which of the following is not composed in an RS 232 serial interface signal?50. ASCII characterc. odd parity bit50. Even parity bitd. stop bit

DATA COMMUNICATIONS MODEMS - Blk11. What is/are the other name/s of Data Communications Modem?1. 1. Datasets1. Dataphones1. Modems1. All of the above1. 1. DCE stands for?1. 1. digital communication equipment1. digital communication encoder1. data communication equipment1. data communication encoder1. 1. The approximated bandwidth used for transporting analog voice signals.1. 1. 300 kHz 3000 kHz1. 300 Hz 3000 Hz1. 30 kHz 300 kHz1. 30 Hz 300 Hz1. 1. The rate of change of signals on the transmission medium after encoding and modulation have occurred1. 1. Baud1. Bit1. Byte1. Data1. 1. It interfaces the modem transmitter and receiver to the serial interface.1. 1. Serial interface circuit1. Modulator circuit1. Telco interface circuit1. Demodulator circuit1. 1. The rate of change of the digital information signal1. 1. Baud1. Bit1. Byte1. Data1. 1. A special internally generated bit pattern in transmit modem1. 1. Parity bit1. Training sequence1. Marking parity1. Parity1. 1. It is used to match the impedance of the modem to the impedance of the telephone line and regulate the amplitude of the transmit signal.1. 1. Bandpass filter and equalizer circuit1. Modulator circuit1. Demodulator circuit1. Telco interface circuit1. 1. It produces the analog carriers necessary for the modulation and demodulation process.1. 1. Bandpass filter and equalizer circuit1. Carrier generation circuit1. Clock generation circuit1. None of the above1. 1. High-speed synchronous voice band modems operate at what frequency?1. 1. 9600 bps, 16 QAM1. 9600 bps, 8-PSK1. 2400 bps, 16 QAM1. 2400 bps, 8-PSK1. 1. Modulation scheme used in medium speed synchronous voice-band modems1. 1. FSK1. PSK1. QAM1. ASK1. 1. It converts the digital pulses to analog signals.1. 1. DCE1. DAC1. Both a and b1. None of the above1. 1. The specification of the old Bell type 103 modem were:1. 1. 600 bps, full duplex, FSK1. 600 bps, half duplex, FSK1. 300 bps, full duplex, FSK1. 300 bps, half duplex, FSK1. 1. These are low speed voice band modems.1. 1. Synchronous modems1. Asynchronous modems1. Isochronous modems1. None of the above1. 1. Asynchronous modems used what scheme of modulation?1. 1. ASK1. FSK1. Both a and b1. None of the above1. Application of asynchronous voice-band modems1. 1. Telemetry1. Caller ID1. Both a and b1. None of the above1. 1. Capable of operating at full duplex over a two-wire telephone line at 300 bps.1. 1. Bell System 202T1. Bell System 202S1. Bell System 1031. Bell System2011. 1. Bell System 202 modem has ______ baud rate.1. 1. 3001. 6001. 9001. 12001. It is when asynchronous data is transported by asynchronous modem.1. 1. Bus1. Isochronous transmission1. Data transmission1. Training sequence1. 1. It uses PSK or QAM to transport data.1. 1. Synchronous modems1. Asynchronous modems1. Isochronous modems1. None of the above

37. What is/are the other name/s of Data Communications Modem?e. f. Datasetsg. Dataphonesh. Modemsi. All of the above38. 39. DCE stands for?e. f. digital communication equipmentg. digital communication encoderh. data communication equipmenti. data communication encoder40. 41. The approximated bandwidth used for transporting analog voice signals.e. f. 300 kHz 3000 kHzg. 300 Hz 3000 Hzh. 30 kHz 300 kHzi. 30 Hz 300 Hz42. 43. The rate of change of signals on the transmission medium after encoding and modulation have occurrede. f. Baudg. Bith. Bytei. Data44. 45. It interfaces the modem transmitter and receiver to the serial interface.e. f. Serial interface circuitg. Modulator circuith. Telco interface circuiti. Demodulator circuit46. 47. The rate of change of the digital information signale. f. Baudg. Bith. Bytei. Data48. 49. A special internally generated bit pattern in transmit modeme. f. Parity bitg. Training sequenceh. Marking parityi. Parity50. 51. It is used to match the impedance of the modem to the impedance of the telephone line and regulate the amplitude of the transmit signal.e. f. Bandpass filter and equalizer circuitg. Modulator circuith. Demodulator circuiti. Telco interface circuit52. 53. It produces the analog carriers necessary for the modulation and demodulation process.e. f. Bandpass filter and equalizer circuitg. Carrier generation circuith. Clock generation circuiti. None of the above54. 55. High-speed synchronous voice band modems operate at what frequency?e. f. 9600 bps, 16 QAMg. 9600 bps, 8-PSKh. 2400 bps, 16 QAMi. 2400 bps, 8-PSK56. 57. Modulation scheme used in medium speed synchronous voice-band modemse. f. FSKg. PSKh. QAMi. ASK

58. It converts the digital pulses to analog signals.e. f. DCEg. DACh. Both a and bi. None of the above59. 60. The specification of the old Bell type 103 modem were:e. f. 600 bps, full duplex, FSKg. 600 bps, half duplex, FSKh. 300 bps, full duplex, FSKi. 300 bps, half duplex, FSK61. 62. These are low speed voice band modems.e. f. Synchronous modemsg. Asynchronous modemsh. Isochronous modemsi. None of the above63. 64. Asynchronous modems used what scheme of modulation?e. f. ASKg. FSKh. Both a and bi. None of the above65. 66. Application of asynchronous voice-band modemse. f. Telemetryg. Caller IDh. Both a and bi. None of the above67. 68. Capable of operating at full duplex over a two-wire telephone line at 300 bps.e. f. Bell System 202Tg. Bell System 202Sh. Bell System 103i. Bell System20169. 70. Bell System 202 modem has ______ baud rate.e. f. 300g. 600h. 900i. 120071. 72. It is when asynchronous data is transported by asynchronous modem.e. f. Busg. Isochronous transmissionh. Data transmissioni. Training sequence73. It uses PSK or QAM to transport data.e. f. Synchronous modemsg. Asynchronous modemsh. Isochronous modemsi. None of the above

DATA communications modem blk21. Interface digital terminal equipments to analog communications facilities.

1. data sets1. dataphones1. Modems1. All of the above1. 1. Most common type of modem

3. Telephone-loop Modems3. Broadband Modems3. DTE3. Bell System-Compatible Modems

1. Can operate using different set of standards and protocols compared to telephone loops

3. Telephone-loop Modems3. Broadband Modems3. DTE3. Bell System-Compatible Modems

1. Refers to the rate of change of the signal on the transmission medium after encoding and modulation have occurred.

4. Bps4. Modulation4. Baud rate4. Transmission1. Transmission rate of 9600 bps or less. 5. 5. Telephone-loop Modems5. Broadband Modems5. DTE5. Bell System-Compatible Modems1. 1. Interfaces the modem transmitter and receiver to the Serial interface. It also manages the flow of control, timing, and data information transferred between the DTE and the modem

7. Serial Interface Circuit7. Bandpass filter7. Modulator Circuit7. Telco Interface

1. Receives digital information. It converts digital changes in the information to analog

8. Serial Interface Circuit8. Bandpass filter8. Modulator Circuit8. Telco Interface1. Limits the bandwidth of the digitally modulated analog signals to the bandwidth appropriate for transmission over a standard telephone circuit.

9. Serial Interface Circuit9. Bandpass filter9. Modulator Circuit9. Telco Interface

1. It is the transmission of synchronous data over asynchronous data communications voice-band modems.

10. Asosynchronous Transmission10. Isosynchronous Transmission10. Isotropic Transmission10. None of the Above1. The following are features of a Data Communication Modem except:

11. Caller ID recognition11. Telephone Directory11. Error Detection11. Data Compression and Expansion

1. A high-speed synchronous voice-band modem operates at:12. 12. 16-QAM; 9.6 kbps; 4 bps/Hz12. 16-QAM; 9.6 bps; 4 kbps/Hz12. 16-QAM; 9.6 kbps; 4 kbps/Hz12. 16-QAM; 9.6 kbps; 4 bps/KHz1. 1. What digital modulation scheme does the Bell System Compatible Modem 209 A/B use?

14. 16-PSK14. 16-QAM14. 8-PSK14. None of the above

1. A form of digital modulation where the digital information is contained in both amplitude and phase of the transmitted carrier15. 15. Quadrative Amplitude Modulation15. Quadrature Amplitude Modulation15. Quadruple Amplitude Modulation15. Quadratic Amplitude Modulation

1. Low-band channel frequency ranges from:

16. 300-1650 Hz16. 350-1600 Hz16. 300-1670 Hz16. None of the above

1. Compensation for phase delay distortion and amplitude distortion inherently present on telephone communications channel.

1. Equalization1. Synchronization1. Convention1. Configuration

1. Equalizer located in the transmit section of a modem.

1. Compromise1. Pre-equalizer1. Adaptive1. Post-equalizer

1. Equalizer located in the receiver section of a modem.

1. Compromise1. Pre-equalizer1. Adaptive1. Post-equalizer

1. Typically, compromise equalizers affect the following:

1. Amplitude1. Delay1. Both a and b1. None of the above

1. A special, internally generated bit pattern produced by a transmit modem.

1. Training Sequence1. Equalizer1. Adapters1. Carrier

1. RLSD stands for:

1. Received Line Signal Detector1. Request Line Signal Detection1. Reverse Line Signal Detector1. Receiver Line Signal Detector

ITU-T Modem Recommendations blk11. The ITU-T specifications are known as __________. a. b. EBCDICc. X-seriesd. V-seriese. ASCII2. 3. The ITU-T V.29 specification is the first internationally accepted standard for __________ data transmission rate.a. b. 9600 bpsc. 1200 bpsd. 2400 bpse. 4800 bps4. 5. Pseudo full-duplex operation can be achieved over two-wire lines using a method called __________.a. b. pingc. ping-pongd. ponge. none of these6. 7. In V.32, what advanced coding technique is used?a. b. Baudotc. Discreted. Continuouse. Trellis8. 9. The constellation diagram for 32-sate trellis encoding was developed by __________.a. b. Dr. Ungerboeckc. Thomas Murrayd. Emile Baudote. Konrad Zuis10. 11. Full-duplex operation over two-wire switched telephone lines is achieved with V.32 using a technique called __________.a. b. QAM constellationc. statistical duplexingd. echo cancellatione. none of these12. 13. ITU-T recommendation V.32bis was introduced in the year __________.a. b. 1990c. 1991d. 1992e. 199314. 15. V.32bis uses a __________ signal constellation with each signalling condition representing 6 bits of data.a. b. 16-pointc. 32-pointd. 48-pointe. 64-point16. 17. __________ feature slowly reduces the transmission bit rates to 12.2 kbps, 9.6 kbps, or 4.8 kbps if the quality of the communication line degrades on V.32bis.a. b. Fall-backc. Fall-forwardd. Ping-ponge. Echo Cancellation18. 19. In V.32bis, __________ feature gives the modem the ability to return to the higher transmission rate when the quality of channel improves.a. b. fall-backc. fall-forwardd. ping-ponge. echo cancellation20. 21. The __________ signal constellation is used on V.33.a. b. 128-pointc. 64-pointd. 32-pointe. 16-point22. 23. This ITU-T standard is used in electrocardiogram over telephone lines.a. b. V.13c. V.14d. V.15e. V.1624. 25. This standard limits the output power levels of modems used on telephone lines.a. b. V.5c. V.4d. V.2e. V.126. 27. This standard is focused on the maintenance of international data circuits.a. b. V.50c. V.51d. V.52e. V.5328. 29. This ITU-T standard was accepted in the year 2000.a. b. V.92c. V.100d. V.110e. V.12030. 31. The ITU-T developed the __________ specification in February 1998 during a meeting in Geneva, Switzerland.a. b. V.56c. V.57d. V.90e. V.9232. 33. This standard is an enhancement adopted by the ITU in 1996.a. b. V.31bisc. V.34td. V.42bise. V.32terbo34. 35. This is a standard for acoustical couplers.a. b. V.13c. V.14d. V.15e. V.1636. 37. This is a standard for loop test devices for modems.a. b. V.51c. V.52d. V.53e. V.5438. 39. This standard defines binary 0/1 data bits as space/mark line conditions.a. b. V.1c. V.2d. V.4e. V.5

ITU-T Modem Recommendations blk21. Data sent to the modem at each end of the circuit by their respective DTE are buffered and automatically exchanged over the data link by rapidly turning the carriers on and off in succession?1. 1. ping-pong b. trellis encodingc. echo cancellationd. statistical duplexing

1. Using this, pseudo full-duplex operation over two wire-line can also accomplished, it utilizes a 300-bps reverse data channel?1. 1. ping-pong b. trellis encodingc. echo cancellationd. statistical duplexing

1. Involves an adding an inverted replica of the transmitted signal to the received signal?1. 1. ping-pong b. trellis encodingc. echo cancellationd. statistical duplexing1. The first internationally accepted standard for 9600bps data transmission rate.1. 1. ITU-T V.29b. ITU-T V.32 c. ITU-T V.32bis d. ITU-T V.42

1. It is intended to provide synchronous data transmission over four-wire leased lines.1. 1. V.29b. V.32c. V.32bis d. V.42

1. It addresses asynchronous-to synchronous transmission conversions and error control that includes both detection and correction. It specifies a new protocol called Link Access Procedures for Modems.1. 1. V.29b. V.32c. V.32bisd. V.421. 1. An enhanced standard adopted by ITU in 1996. It adds 31.2 kbps and 33.6 kbps to the V.34 specification.1. 1. V.29b. V.32c. V.34+d. V.901. Developed by ITU-T in February 1998 during a meeting in Geneva, Switzerland. It defines an asymmetrical data transmission technology where the upstream 33.6kbps and downstream of 56kbps. 1. 1. V.29b. V.32c. V.34+d. V.901. A new modem standard in 2000 which offers 3 improvements over V.90 that can be achieved only if both the transmit and receive modems and the internet Service Provider (ISP) are compliant. It offers; upstream transmission rate of 48 kbps, faster call setup capabilities, incorporation of a hold option1. 1. V.92b. V.90c. V.32d. V.341. 1. This feature slowly reduces the transmission bit rate from 14.4 kbps to 12.2 kbps, 9.6 kbps or 4.8 kbps if the quality of communication line degrades.1. 1. ping-pong b. trellis encodingc. fall-backd. fall-forward

1. It gives the modem the ability to return to the higher transmission rate when the quality of communications channel improves.1. 1. ping-pong b. trellis encodingc. fall-backd. fall-forward

1. Defines binary 0/1 data bits as space/mark line conditions1. 1. V.1b. V.2c. V.4d. V.51. Limits output power levels of modem used on telephone lines.1. 1. V.1b. V.2c. V.4d. V.51. Standard synchronous signalling rate for dial-up telephone lines.1. 1. V.1b. V.2c. V.4d. V.51. Sequence of bits within a transmitted character.1. 1. V.1b. V.2c. V.4d. V.51. Electrical characteristics for V. 24 1. 1. V.1b. V.2c. V.28d. V.311. Older electrical characteristics rarely used today.1. 1. V.10b. V.2c. V.28d. V.311. Unbalanced high speed electrical interface specification (similar to RS-423).1. 1. V.10b. V.11c. V.28d. V.311. Balanced high speed electrical interface specification (similar to RS-423).1. 1. V.10b. V.11c. V.28d. V.201. Parallel data transmission modems1. 1. V.10b. V.11c. V.28d. V.20

Data Link Protocol Functions- blk11. What is the protocol layer that transfers data between adjacent network nodes in awide area network?a. b. Data Link Layerb. Physical Layer c. Application Layerd. Session Layer2. 3. Which is not a function of Data Link layer?a. b. Error Controlc. Line Disciplined. Data Encryptione. Flow Control4. 5. It determines which device can send and when it can send.a. b. Error Controlc. Line Disciplined. Data Encryptione. Flow Control6. 7. It defines a set of procedures that tells the transmitting station how much data it can send.a. b. Error Controlc. Line Disciplined. Data Encryptione. Flow Control8. 9. It is concerned primarily with error detection and message retransmission.a. b. Error Controlc. Line Disciplined. Data Encryptione. Flow Control10. 11. Which is not a part of Line Discipline?a. b. Enquiryc. Acknowledgementd. Poll/Selecte. Stop-and-wait12. 13. The response to enquiry when the receiver is not ready to receive.a. b. Positive Acknowledgementc. Negative Acknowledgementd. Balance Acknowledgemente. Zero Acknowledgement14. 15. The response to enquiry when the receiver is ready to receive.a. b. Positive Acknowledgementc. Negative Acknowledgementd. Balance Acknowledgemente. Zero Acknowledgement16. 17. It is a solicitation sent from the primary to a secondary to determine if the secondary has a data to transmit.a. b. Pollc. Addressesd. Selectione. Enquiry18. 19. It is how the primary designates a secondary as a destination or recipient of data.a. b. Pollc. Addressesd. Selectione. Enquiry20. 21. ARQ stands for __________.a. b. Amplified Resonance Queryc. Automatic Repeat Questiond. Amplified Resonance Requeste. Automatic Repeat Request22. EOT stands fora. b. Enquiry of Transferc. End of Transferd. Enquiry of Transmite. End of Transmit23. It uses a window size to control the number of unacknowledged frames outstanding?a. b. Poll/Selectc. ENQ/ACKd. Stop-and-Wait ARQe. Go-back-n ARQ24. 25. The source transmits a single frame, and waits for an ACK.a. b. Poll/Selectc. ENQ/ACKd. Stop-and-Wait ARQe. Go-back-n ARQ26. 27. A source station can transmit several frames in succession before receiving an acknowledgement.a. b. Stop-and-Wait ARQc. Go-back-n ARQd. Stop-and-Wait Flow controle. Sliding Window Flow control28. 29. Header of a frame generally contains __________.a. b. synchronization bytesc. addressesd. frame identifiere. all of the above30. 31. When 2 or more bits in a data unit have been changed during the transmission, the error is called __________.a. b. Random errorc. Burst errord. Inverted errore. None of the above32. 33. Which one of the following is adata linkprotocol?a. b. Ethernetc. Point-to-Point Protocold. HDLCe. All of the above34. 35. Which sublayer of thedata linklayer performsdata linkfunctions that depend upon the type of medium?a. b. Logical Link Control Sublayerc. Media Access Control Sublayerd. Network Interface Control Sublayere. None of the above36. 37. CRC stands for __________.a. b. Cyclic Redundancy Checkc. Code Repeat Checkd. Code Redundancy Checke. Cyclic Repeat Check

Data Link Protocol Functions blk21) The receiving station is also called the _________.

a) Master Stationb) Primary Stationc) Slave Stationd) Control Station2) 3) The primary disadvantage of sliding window flow control.a) b) Capacityc) Network Utilizationd) Speede) Cost

4) Refers to the imaginary receptacles at the source and destination stations with the capacity of holding several frames of data.a) b) Stop-and-waitc) Go-back-nssd) Sliding Windowe) Automatic Repeat Request5) Error correction is generally accomplished with a type of retransmission.a) b) Automatic Repeat Requestc) Stop-and-waitd) Sliding Windowe) Go-back-n

6) Coordinates half-duplex transmission on a data communications network.a) b) Error Controlc) Flow Controld) Data-link protocole) Line Discipline

7) Frame, block, or packet of data transmitted to initiate session.a) b) ACKc) ENQd) NAKe) EOT

8) Means of detecting and correcting transmission errors.a) b) Flow Controlc) Error Controld) Line Disciplinee) Data-link protocol9) Set of rules implementing and governing an orderly exchange of data between layer two devices.

a) Line Disciplineb) Error Controlc) Data-link protocold) Flow Control

10) All stations are equal, and any station can transmit at any time.

a) Primary-secondary networkb) Data communication networkc) Interconnection of networkd) Peer-to-peer network

11) Coordinates the rate at which data are transported over a link.

a) Error Controlb) Data-link protocolc) Line Disciplined) Flow Control

12) Solicitation sent from the primary to a secondary to determine if the secondary is ready to receive data.

a) Pollb) Selectionc) Acknowledgementd) End-of-transmission

13) Query from the primary to determine if the secondary is ready to receive data.

a) End-of-transmissionb) Pollc) Selectiond) Acknowledgement

14) Transmitting statain sends one message frame and then waits for an acknowledgement before sending the next message frame.

a) Automatic Repeat Requestb) Sliding Windowc) Stop-and-waitd) Selective Repeat

15) Primary advantage of stop-and-wait.

a) Accuracyb) Simplicityc) Speedd) Reliability16) 17) Primary disadvantage of stop-and-wait.

a) Accuracyb) Speedc) Reliabilityd) Simplicity

18) Response when the destination is ready to receive.

a) NAKb) ENQc) ACKd) EOT

19) General number of unsuccessful attempts to establish communications.

a) Threeb) Fivec) Twod) Four

20) Situation where the initiating station gives up establishing communications after several attempts.

a) Give-upb) End-of-transmissionc) Back-endd) Time-out

21) A station may send multiple frames as allowed by the window size.

a) Go-back-nb) Sliding Windowc) Stop-and-waitd) Selective Repeat

22) The sender only retransmits frames for which a NAK is received.

a) Go-back-nb) Sliding Windowc) Stop-and-waitd) Selective Repeat

CHARACTER- AND BIT-ORIENTED DATA-LINK PROTOCOLS blk1 1. Protocols that transmit and control information either in separate control frames or in the form of overhead that is added to the data and included in the same frame.a. b. Overhead Protocol c. Control Protocold. Data-Link Protocol e. Bit-Oriented Protocol2. 3. Data-link protocols can be classified as __________.a. b. Bit-oriented or Character-orientedc. Data-oriented or Modem-Oriented discernd. a and be. none of the above4. 5. Interprets a frame of data as a group of successive bits combined into predefined patterns of fixed length.a. b. Character-oriented protocolc. Bit-oriented protocol d. a and be. none of the above6. 7. The length of successive bits in character-oriented protocol is usually __________ bits.a. b. 2c. 4d. 8e. 168. 9. Indicates that the next character is the first character of the texta. b. ETXc. STXd. BSCe. SDLC10. 11. Indicates that the next character is the last character of the texta. b. ETXc. STXd. BSCe. SDLC12. 13. Character-oriented protocols are sometimes called __________.a. b. byte-oriented protocolsc. bit-oriented protocolsd. frame-oriented protocolse. data-oriented protocols14. 15. Bit-oriented protocols are __________ than character-oriented protocols.a. b. less efficientc. more efficientd. same efficiencye. it depends16. 17. A discipline for serial-by-bit information transfer over a data communications channela. b. Character-Oriented Protocolsc. Byte-Oriented Protocolsd. Frame-Oriented Protocolse. Bit-Oriented Protocols18. 19. Most popular bit-oriented protocols are: a. b. BSCc. SDLC and HDLCd. BLASTe. XMODEM and YMODEM11. 12. Relatively simple, character-oriented protocols generally used on two-point networks using asynchronous data and asynchronous modema. b. Synchronous Data-Link Protocolsc. Isochronous Data-Link Protocolsd. Asynchronous Data-Link Protocolse. none of the above12. 13. The first file transfer protocol developed by Ward Christiansen in 1979.a. b. WMODEMc. ZMODEM d. YMODEMe. XMODEM13. 14. A data-link control character that is used to indicate the beginning of the headera. b. SOHc. Sequence numberd. Information Fielde. STX14. 15. An asynchronous data-link protocol with information field which has a maximum capacity of 1024 bytes.a. b. XMODEMc. YMODEMd. ZMODEMe. KERMIT15. 16. A data-link protocol where remote stations can have more than one PC or printed.a. b. Asynchronous Data-Link Protocolsc. Bit-oriented protocold. Character-oriented protocols e. Synchronous Data-Link Protocols 16. 17. A synchronous character-oriented data-link protocol developed by IBMa. b. Bisynchronous communications c. Bisyncd. BSC e. all of the above 17. 18. Indicates that the BCC was gooda. b. Positive Acknowledgmentc. Negative Acknowledgmentd. ARQe. NAK18. 19. An automatic request for re-transmissiona. b. Positive Acknowledgmentc. Negative Acknowledgmentd. ARQe. ACK19. 20. Used to terminate blocks of data except the final blocka. b. DLE SYNc. DLE ITBd. DLE ETBe. DLE CRC20. 21. Used to terminate blocks of transparent text other than the final block when the end of intermittent block is used for a block-terminating charactera. b. DLE SYNc. DLE ITBd. DLE ETBe. DLE CRCs

Asynchronous Data-Link Protocols blk21. Relatively simple, character-oriented protocols generally used on two-point networks using asynchronous data and asychronous modems.

a. Synchronous Data-Link Protocolsb. Asynchronous Data-Link Protocolsc. Character-Oriented Data-Link Protocolsd. Bit-Oriented Data-Link Protocols

2. The first file transfer protocol designed to facilitate transferring data between two personal computers over the public switched telephone network.

a. XMODEMb. YMODEMc. ZMODEMd. None of the above

3. Who developed the first file tranfer protocol?

a. Guglielmo Marconib. Bill Gatesc. Ward Christiansend. Emile Baudot

4. First field of an XMODEM frame.

a. Start of heading (SOH) fieldb. Header fieldc. Data fieldd. Error detection field

5. Contains the actual user data.

a. Start of heading (SOH) fieldb. Header fieldc. Data fieldd. Error detection field

6. Maximum capacity of information field.

a. 64 bytesb. 128 bytesc. 256 bytesd. 512 bytes

7. Process of transferring data begins for an XMODEM when:

a. Source sends an ACK to the destinationb. Destination sends an ACK to sourcec. Source sends NAK to destinationd. Destination sends NAK to source

8. Who officially gave the YMODEM its name?

a. Guglielmo Marconib. Bill Gatesc. Ward Christiansend. Emile Baudot

9. Character-Oriented Protocol is also known as?

a. Alphabet Oriented Protocolb Byte Oriented Protocolc. Bit Oriented Protocold. None of the above

10. Which is true in a Character-Oriented Protocol?a. All control and data information are exchanged in the form of characters from a character code setb. Is a discipline for serial-by-bit information transferc. Both A & Cd. None of the above11. In a Character-Oriented Protocol a character is equivalent to how many bits?

a. 4b. 8c. 2d. 1

12. Which statement is true?a. Character-oriented protocols are more efficient than bit-oriented protocolsb. Character-oriented protocol is one classification of data-link layerc. Bit-oriented protocols are more efficient than character-oriented protocolsd. Both A and B13. The main character-oriented protocol used today is?

a. M-SYNCb. N-SYNCc. BI-SYNCd. TRI-SYNC

14. Which statement is false in a bit-oriented protocol?a. Data-link control information is transferred as a series of successive bits that may be interpreted individually on a bit-by-bit basis or in groups of several bitsb. There are no dedicated data link control charactersc. The control field within a frame conveys only one control functiond. Is a discipline for serial-by-bit information transfer over a data communications channel15. It is a group of digital devices

a. Clusterb. Linkc. Poll d. Data

16. It the most common synchronous data link protocol a. Binary Synchronous Communicationsb. 16-ary Synchronous Communicationsc. 64-ary Synchronous Communicationsd. 128-ary Synchronous Communications17. Binary Synchronous Communications (BSC) is developed by

a. Xeroxb. Intelc. IBMd. Samsung

18. With Binary Synchronous Communications, each data transmission is preceded by how many synchronization characters?

a. 5b. 4c. 3d. 2

19. _____ is used to terminate all blocks of data except the final block.

a. DLE ETBb. DLE ITBc. DLE SYNd. DLE DLE

20. _____ is used to terminate blocks of transparent text other than the final block.

a. DLE ETBb. DLE ITBc. DLE SYNd. DLE DLE

SYNCHRONOUS DATA-LINK PROTOCOL blk11. What is the first link-layer protocol based on synchronous, bit-oriented operation?a. b. Synchronous Data-Link Controlc. High-Level Data-Link Controld. Link Access Proceduree. IEEE 802.22. 3. An address common to a number of stationsa. b. Broadcast addressc. Station addressd. Group addresse. IP block4. 5. How many addresses are possible in an address field?a. b. 252c. 256d. 254e. 2486. 7. It prevents the flag pattern from occurring anywhere else in the frame.a. b. Flag bitc. Zero insertiond. Sequential Framee. Cyclic Redundancy Checking8. 9. The ending and beginning flag has the binary format __________.a. b. 01111110c. 10000000d. 10000001e. 0000110X10. 11. It is an eight-bit field that identifies the type of frame being transmitted.a. b. Flag fieldc. Address fieldd. Control fielde. Information field12. 13. The following are the frame formats with SDLC except for?a. b. Informationc. Supervisoryd. Unnumberede. Frame-check14. 15. Used for transmitting sequenced information that must be acknowledged by the destination station.a. b. Informationc. Supervisoryd. Unnumberede. Frame-check16. 17. With this frame format, an information field is not allowed.a. b. Informationc. Supervisoryd. Unnumberede. Frame-check18. 19. Identified by making bits b6 and b7 in the control field both logic 1s. a. b. Informationc. Supervisoryd. Unnumberede. Frame-check20. 21. Generating polynomial used by the Frame Check Sequence Field. a. b. x^7+x^5+x^4+x^2+1c. x^16+x^12+x^5+1d. x^16+x^13+x^10+5e. x^9+x^6+x^322. 23. SDLC loop operation operates in __________. a. b. Full duplexc. Simplexd. Full/full duplexe. Half-duplex24. 25. It is a subcommand used to isolate open-loop continuity problems. a. b. Wrap c. Modified-Link Testd. Beacon Teste. Modified Link Test26. 27. Eight consecutive logic 0s sent by the primary after the last framea. b. Go-ahead sequence c. Turn-around sequenced. Clear sequencee. Last flag28. 29. Secondary stations cannot transmit frames of their own until they receive a frame with the __________. a. b. X bit setc. F bit setd. P bit sete. Y bit set16. 17. An SDLC operation that discusses the occurrence of the flag bit sequencea. b. SDLC Transparencyc. SDLC Loop Configurationd. SDLC Occurrence Sequencee. SDLC Bit Sequence18. 19. A mechanism that inserts 0 in able to provide more reliable framesa. b. Zero Bit Insertionc. Zero Bit Stuffingd. a and be. None of the above20. 21. Used to prematurely terminate an SDLC framea. b. Message Rejectc. Message Rejectd. Message Aborte. Message Cancel22. 23. Superset of SDLCa. b. SDLC-Ac. HDLCd. a and be. None of the above24. What is the term when a station is logically disconnected from the network?a. b. Normal Separate Modec. Normal Disconnect Moded. Normal Disengage Modee. Normal Detach Mode

SDLC blk21. Used to prematurely terminate an SDLC frame1. 1. DCE1. DTE1. Message Abort1. Switch

1. Message abort is any occurrence of __ to __ consecutive logic 1s1. 1. 6-131. 3-201. 7-141. 5-14

1. State wherein there are 15 or more contiguous logic 1s present.1. 1. Idle State1. Ready State1. Reading State1. Encoding State

1. Encoding scheme used with SDLC because it guarantees at least one transition in the data for every seven (7) bits transmitted.1. 1. Revert-on-zero coding1. Invert-on-one coding1. Revert-on-one coding1. Invert-on-zero coding

1. What does NRZI mean?1. 1. Nonreturn-to-zero inverted1. Null-refer-to-zero information1. Nonreduce-to-zero inverted1. Nonreceive-to-zero inverted

1. Encoding that was originally intended for asynchronous modems that do not have clock recovery capabilities.1. 1. NRZI1. Manchester1. RZ1. NRZ

1. Which of the following is the CORRECT frame format for SDLC?1. Flag-FCS-Information-Control-Address 1. Flag-Information-Control-Address-FCS 1. Flag-Address-Control-Information-FCS 1. Flag-Control-Information-FCS-Address1. This exists whenever the primary or the secondary stations is transmitting.1. 1. Active state1. Idle state1. Transient state1. None of the above

1. Bit sequence of a flag1. 1. 001111101. 010101011. 011111101. 10000001

1. it is identified by making bits b6 and b7 in the control field both logic 1s1. 1. Unnumbered frame1. Information frame1. Control frame1. Supervisory frame1. 1. A command that places a secondary station into the initialization mode.1. 1. RIM1. SIM1. SNRM1. UA

1. In which layer does SDLC belongs to?1. 1. layer 31. layer 11. layer 21. layer 4

1. It is a response transmitted from a secondary station if the primary station attempts to send numbered information frames to it when the secondary station is in the normal disconnect mode.1. 1. RD1. DISC1. DM1. UA

1. It is the field that contains the error detection for SDLC.1. 1. Control1. FCC1. Information1. CRC1. What does SDLC stand for?1. 1. Synchronous Data-Line Control1. Synchronous Data-Link Control1. Synchronous Data-Link Computing1. Systematic Data-Link Control1. 1. SDLC loop operates on ________ - duplex.1. 1. Full-Full1. Full1. Half-Full1. Half

1. What signals the end of the primarys transmissions, signified by a flag followed by 8 logic 0s.1. 1. Turnabout sequence1. Turnaround sequence1. Turnawheel sequence1. Turnagainst sequence

1. SDLC configure command/response (CFGR) that causes the addressed secondary station to place itself into receive-only mode. Once in this mode, the station cannot transmit until it receives a clear command.1. 1. Wrap1. Self-Test1. Monitor1. Beacon Test1. A solution to make a receiver transparent to all data located between beginning and ending flags in an SDLC frame.1. 1. SDLC Transparency1. SDLC Translucency1. SDLC Opaqueness1. SDLC Reflectiveness

1. What is the transparency mechanism used with SDLC? It is done by automatically inserting a logic 0 after any occurrence of five consecutive logic 1s except in a designated flag before transmission. And when five consecutive logic 1s are received and the next bit is a 0, 0 is automatically deleted or removed.1. 1. Logical insertion/deletion1. Designated Flag Automated Checking (DFAC)1. Zero Bit insertion/deletion1. Frame Check Corrector

High-Level Data Link Control blk11. What organization modified Synchronous Data Link Control to create High Level Data Link Control?

a. ITU-Tb. ISOc. OSId. IBM

2. High Level Data Link Control is a _____ of Synchronous Data Link Control.

a. superiorb. branchc. subsetd. superset

3. How many standards comprises High Level Data Link Control?

a. 2b. 3c. 4d. 5

4. A data organized in a unit is called _____.

a. synchronousb. in syncc. framed. information

5. High Level Data Link Control protocol is under what layer of the Open System Interconnection (OSI) model?

a. Layer 4b. Layer 3c. Layer 2d. Layer 16. It is referred to as the controlling station in High Level Data Link Control.

a. Primary Stationb. Secondary Stationc. Master Stationd. Combined Station

7. Error Recovery means _______.a. recovering a deleted errorb. recovering a detected errorc. ability of the equipment to continue to run even after an error has occurredd. ability of an error or threat to come back after being detected and fixed8. Frames from the primary station are called ______.

a. Primary Frameb. Command Framec. Response Framed. Unnumbered Frame

9. The secondary station only responds to the primary if asked to do so.

a. Trueb. Falsec. No idead. It depends

10. A station known to be in full control of itself.

a. Primary Stationb. Independent Stationc. Combined Stationd. Secondary Station11. How many operational modes does HDLC offer?

a. 2b. 3c. 4d. 5

12. In this mode, the primary station doesn't initiate transfers to the secondary station.

a. Normal Response Modeb. Asynchronous Response Modec. Asynchronous Balanced Moded. Normal Disconnected Mode

13. The two disconnected modes (NDM and ADM) differ from the operational modes in a way that ______.a. they are disconnectedb. the secondary station is logically disconnected from the linkc. the secondary station is physically disconnected from the linkd. they do not operate14. The "asynchronous" in both Asynchronous Response Mode (ARM) and Asynchronous Balanced Mode (ABM) does not refer to the format of the data on the link.

a. trueb. falsec. neitherd. it depends

15. This mode uses combined stations. There is no need for permission on the part of any station in this modea. Asynchronous Balanced Modeb. Asynchronous Disconnected Modec. Combined Balanced Moded. Normal Response Mode

16. This type of mode is better for point-to-point links since it reduces overhead.

a. Normal Response Modeb. Asynchronous Balanced Modec. Combined Moded. Asynchronous Response Mode

17. During half duplex in this mode, the secondary station must wait until it detects and idle channel before it can transfer any frames.

a. Synchronous Data Link Controlb. Stop and Waitc. Asynchronous Response Moded. Normal Response Mode18. This is the mode in which the primary station initiates transfers to the secondary station.

a. Initiation Modeb. Primary Modec. Normal Response Moded. Operational Modes

19. This mode is only used within an unbalanced configuration.

a. Asynchronous Unbalanced Modeb. Synchronous Balanced Modec. Normal Response Moded. Asynchronous Response Mode

20. IM in HDLC means _______.

a. Instant Messagingb. Important Messagec. Initialization Moded. Instantaneous Means

21. A term used to indicate an entity of data.

a. Frameb. Packetc. Informationd. Bits

22. The first field in an HDLC frame structure.

a. Primary Fieldb. Flag Fieldc. Initialization Fieldd. Corn Field

23. Flag field sequence.

a. 0111110b. 1110111c. 00111100d. 01111110

24. ________ are continuously transmitted on the link between frames to keep the link active.

a. Synchronousb. Continuous datac. Flagd. Control

25. The time between the transmission of actual frames is called the ______.

a. idle timeb. break timec. interframe time filld. spacing time

26. This field identifies the primary or secondary stations involvement in the frame transmission or reception.

a. relationb. addressc. stationd. frame

27. A field used to control the communications process.

a. Toll fieldb. Control Fieldc. Primary fieldd. Secondary Field28. This control field performs control functions such as acknowledgment of frames, requests for re-transmission, and requests for temporary suspension of frames being transmitted.

a. function fieldb. supervisory formatc. ack fieldd. data process field

29. The 5thbit position in the control field is called _______.

a. control fieldb. poll/final bitc. address fieldd. information field

30. This field contains the actual data the sender is transmitting to the receiver.

a. information fieldb. message fieldc. data fieldd. retransmission field

PUBLIC-SWITCHED DATA NETWORKS blk11. It is a device that creates temporary connections between two or more systems. a. b. Routerc. Circuitd. Switche. Terminal2. 3. It involves dividing data messages into small bundles of information and transmitting them through communications networks to their intended destinations using computer-controlled switches.a. Value Added Networksc. Node-to-Node Communicationb. Packet Switchingd. Frame Relay4. It is a methodology of implementing atelecommunications networkin which twonetwork nodesestablish a dedicated communications channel(circuit) through the network before the nodes may communicate. a. Packet Switchingc. Switchers Switchesb. Message Switchingd. Circuit Switching5. This is the foundation of the Public Switched Telephone Network (PSTN).a. Packet Switchingc. Switchers Switchesb. Message Switchingd. Circuit Switching6. It is the time required to establish the calla. Blocking c. Setup Timeb. Real Timed. Delay7. It is the time when the information is being transferreda. Blocking c. Setup Timeb. Real Timed. Delay8. It is the inability to complete a call because there are no facilities or switching paths available between the source and destination locationsa. Blocking c. Setup Timeb. Real Timed. Delay9. What is the type of network transmission that supports Public Switched Telephone Network?a. Circuit Switchingc.Packet Switchingb. Message Switchingd.None of these 10. Which of the following is not an example of Value Added Network? a. Tymnet Inc.c.DATAPACb. VANsd.GTE telnet 11. The first Public Data Switched Networka. X.25c.X.1 b. Frame Relayd.None of these12. Which is not true about Public Switched Data Network?a. They provide direct connection between networks.b. Combine the concepts of value-added networks and packet switching networks.c. It comprised of one or more wide area data networks designed to provide access to a large number of subscribers with a variety of computer equipment.d. Transport data from a source to a destination through a network of intermediate switching nodes and transmission media. 13. American commercial packet switched network which went into service in 1974.a. DATAPACc.Tymnet Inc. b. TRANSPACd.GTE Telnet14. A network that adds value to the services or facilities provided by a common carrier to provide new types of connection services.a. ISPc.Tierb. VANsd.None of these15. Message switching is a form ofa. store-and-forwardc.touch-and-forwardb. hold-and-forwardd.slide-and-forward16. Data, including source and destination identification codes, are transmitted into a network and stored in a _____.a. computerc.switchb. routerd.printer17. Type of switching techniques in which data are not transferred in real time.a. Packet Switchingc.Circuit Switchingb. Message Switchingd.None of these18. The following are the advantages of message switching except for:a. It provides efficient traffic management by assigning priorities to the messages to be switched.b. It operates in real time.c. No physical connection is required between the source & destination as it is in circuit switching.d. Channels are used effectively and network devices share the data channels.19. Also known as the hold-and-forward network.a. Packet Switchingc.Message Switchingb. Circuit Switchingd.Network Switching20. Which of the following is not true about packet switching?a. requires complex and expensive switching arrangements and complicated protocolsb. hold time is quite shortc. No busy signald. has a dedicated tranmission path21. Message and packet switching is a ___________ switch.a. transparentc.convertibleb. directd.Transactional

PUBLIC-SWITCHED DATA NETWORKS blk11. Used for making a standard telephone calla. b. Circuit-switchingc. Message-switchingd. Store-and-forwarde. Interconnect2. 3. Time required to establish a call a. b. Real timec. Setup timed. Blockinge. Short4. After a call has been established, information is transferred in __________. a. b. Public-Switched Data Networkc. Packetsd. Real timee. Value added network5. 6. It is the inability to complete a call because there are no facilities or switching paths available between the source and destination locations. a. b. Not transferredc. Interconnectd. Hold-and-forwarde. Blocking7. 8. A circuit switch is a transparent switch because it does nothing more than __________ the source and destination. a. b. transferc. hold-and-forwardd. interconnecte. short9. Message switching is a form of __________ network.a. b. packet-switchingc. store-and-forwardd. transactional switche. message-switching10. 11. In message switching, data are __________ in real time. a. b. not transferredc. shortd. transferrede. hold-and-forwarded12. With message switching, blocking __________ occur. a. b. cannotc. cand. both a and be. all of the choices13. 14. Message switch is a __________. a. b. packetc. Public-Switched Data Networkd. Value Added Networke. none of the choices15. Data are divided into smaller segments, called __________. a. b. framesc. bitsd. packetse. segments16. 17. In packet switching, the hold time is generally quite __________.a. b. longc. shortd. importante. negligible18. In packet switching, message transfer is near __________. a. b. real timec. setup timed. hold-and-forward e. store-and-forward19. 20. Packet switching is sometimes called __________ network. a. b. switcher switchesc. value added networkd. node-node communication linke. hold-and-forward21. 22. A switched data communications network designed for transferring of data only. a. b. Public-Switched Data Networkc. Packet Switching Networkd. Value Added Networke. None of the above23. 24. These are switching nodes that connect only to other switching nodes if some switching nodes are already connected to end stations. a. b. Tandem switching nodesc. Real time nodesd. Switchers switchese. Both a and c25. 26. The combined concepts of Public Switch Data Networka. Value Added Network and Circuit Switchingb. Packet Switching Network and Circuit Switchingc. Value Added Network and Packet Switching Networkd. Packet Switching Network and Message Switching27. A network which adds value to the services or facilities provided by a common carrier to provide new types of communication services a. b. Value Added Networkc. Transferredd. Both a and ce. None of the choices28. 29. It involves dividing data messages into small bundles of information and transmitting them through communications network to their intended destinations using computer- controlled switches. a. b. Packet Switching Networkc. Value Added Networkd. Both a and ce. None of the choices30. 31. Three common switching techniques used with public data networksa. Circuit Switching, Message Switching, Packet Switchingb. Tandem Switching Nodes, Packet Switching Network, Transactional Switchc. Circuit Switching, Packet Switching Network, Transactional Switchd. Packet Switching, Message Switching, Packet Switching Network32. __________ generally carry multiplexed data. a. b. Framesc. Node-Node Communication Linkd. Communication Linke. All of the Choices

CCITT X.25 USER-TO-NETWORK INTERFACE PROTOCOL blk11. ISO is to seven-layer, X.25 is to three layer namely:1. 1. Physical, session, transport1. Application, session, datalink1. Network, application, transport1. Physical, data link, network2. 3. In circuit switching, path is established for entire message, while in Packet Switching:1. 1. Route established for each packet1. Links are established in every layer1. Route are connected to every layer1. None of the above4. 5. In Message Switching, messages are stored, while in Packet Switching1. 1. Messages are not stored1. Messages are held for a short time1. Messages are stored permanently1. None of the above6. 7. In circuit switching,1. Network responsible for lost messages1. Network may be responsible for each packet but not for the entire messages1. User responsible for message-loss protection1. None of the above8. Packet Switching is the same as __________ when it comes to overhead bits1. 1. Circuit Switching1. Message Switching1. Current Switching1. Equipment Switching9. ANSI 3.66 and HDLC were selected for the __________ layer.1. 1. Physical1. Data-link1. Network1. Transport10. 11. LAPB provides for a two-way __________ communications between DTE and DCE.1. 1. Simplex1. Half duplex1. Full duplex1. Full-full 12. 13. __________ command is used to transmit packets.1. 1. DISC 1. Information1. Send1. DM14. 15. The network layer specifies three switching services namely:1. Permanent virtual call, temporary virtual call, datalink1. Permanent virtual call, virtual call, datagram1. Instagram, permanent call, call waiting1. Packet, circuit, message switching 16. A Virtual Call is__________ arrangement.1. 1. One-one1. One-many1. Many-many1. None of the above17. 18. If messages will fit into single packet where Datagram is somewhat reliable, it is called:1. 1. Single-message per segment protocol1. Single-packet per segment protocol1. Multi-packet per segment protocol1. None of the above19. 20. Two packet formats used in X.251. 1. Send and receive packet1. Front to back packet1. Call request and data transfer packet1. None of the above21. 22. This field identifies the number of digits that appear in the called address field1. 1. Calling address length1. Facilities field1. User data field1. None of the above23. This field identifies the number of eight-bit octet present.1. 1. Rice field1. Protocol Identifier field1. Octomerical Field1. Facilities Length Field24. 25. Deals with network architecture, transmission, signaling, maintenance1. 1. X.441. X.1 through X.391. X.40 through X.1991. None of the above26. 27. A data transfer packet (DTP) is similar to call request packet (CRP) except that:1. DTP has considerably less overhead and can accommodate a much larger user data field.1. CRP has considerably less overhead and can accommodate a much larger user data field1. Both a and b1. None of the above28. The two packet sequence field1. 1. Call request and data transfer1. Send packet and receive packet1. Circuit and Packet 1. None of the above29. 30. CCITT stands for:1. Commission on Communications International for Telephony and Telegraphy.1. Committee Consultative International for Telephony and Telegraphy1. Center for Communications International for Telephony and Telegraphy.1. None of the above.31. ______ is logically equivalent to two-point dedicated private line.1. 1. Datagram1. Virtual call1. Permanent virtual call1. None of the above32. 33. The most efficient service offered in packet switching1. 1. Datagram1. Permanent virtual call1. Virtual call1. None of the above

CCITT X.25 USER TO NETWORK INTERFACE PROTOCOL blk21. LAPB stands for:a. b. Low Access Protocol Balancedc. Link Access Protocol Binaryd. Link Access Protocol Balancede. Link Access Procedure Balanced2. 3. What do you mean by X. in X.25?a. b. Identifying Numberc. Modem Seriesd. Sequencee. None of the above4. What do you mean by 25 in X.25?a. b. Receive Sequence Numberc. Send Sequence Numberd. Identifying Numbere. None of the above5. 6. Which of the following OSI 7 Layer is not included in X.25?a. b. Data Link Layerc. Network Layerd. Physical Layere. Transport Layer7. 8. SABM stands for:a. Synchronous Asynchronous Balanced Modeb. Set Asynchronous Balanced Modec. Set Automatic Balanced Moded. Set Asynchronous Binary Mode9. It is logically equivalent to a two point dedicated private line except slowera. b. Permanent Virtual Callc. Virtual Calld. Datagrame. None of the above10. 11. Logically equivalent to making a telephone call through DDD network except no direct end to end connection is made.a. b. Permanent Virtual Callc. Virtual Calld. Datagrame. None of the above

12. LABP is a subset of:a. b. SDLCc. HDLCd. BSCe. None of the Above13. 14. This frame format is responsible for link initializationa. b. Supervisoryc. Unnumberedd. Informatione. None of the Above15. This frame format is responsible for transmission of dataa. b. Supervisoryc. Unnumberedd. Informatione. None of the Above

16. This frame format is responsible for flow control processa. b. Supervisoryc. Unnumberedd. Informatione. None of the Above

17. X.21 Corresponds to:a. b. RS232c. RS423Ad. RS530e. RS422A

18. This field is used to identify the function and the content of the packeta. b. Packet Typec. Format Identifierd. Logical Channel Identifiere. None of the Above

19. It identifies whether the packet is a new call request or a previously established calla. b. Packet Typec. Format Identifierd. Logical Channel Identifiere. None of the Above

20. This field contains up to 512 bits of optional network facility information.a. b. Packet Typec. Calling Address Lengthd. Facilities Fielde. Facilities Length Field21. 22. This field contains the destination address.a. b. Packet Typec. Calling Address Lengthd. Called Addresse. User Data Field23. It is a 32 bit field reserved for the subscriber to insert user level protocol functions.a. b. Packet Typec. Format Identifierd. Logical Channel Identifiere. Protocol Identifier24. 25. Used on public Data networks of DTE designed for interfacing to asynchronous full-duplex V series modems.a. b. X.20bisc. X.21bisd. X.25e. X.28

26. Used on public Data networks of DTE designed for interfacing to synchronous full-duplex V series modems.a. b. X.20bisc. X.21bisd. X.25e. X.2827. Interface between DTE and DCE for terminals for operating in the packet mode on public data networks.a. b. X.20bisc. X.21bisd. X.25e. X.2828. 29. Another way of requesting transmission of frames.a. b. REJc. RNRd. RRe. UA

30. It is a response to any illegal command for which there is no indication of transmission errors according to the frame check sequencea. b. REJc. RNRd. RRe. FRMR

31. FCS stands for:a. b. Frame Check Sequencec. Frame Character Sequenced. Forward Character Sequencee. Forward Check Sequence

INTEGRATED SERVICE DIGITAL NETWORK blk11. It is a proposed network that is intended to provide worldwide telecommunications support of voice, data, video and facsimile information within the same network. a. b. PSDN c. X.25 d. ISDN e. SDLC2. 3. In essence, the __________ is the integration of a wide range of services into a single multipurpose network. a. b. PSDN c. X.25 d. ISDNe. SDLC4. 5. A network that proposes to interconnect an unlimited number of independent users through a common communications network.a. b. PSDN c. X.25 d. ISDNe. SDLC6. 7. The 64-kbps digital connection is the basic building block of __________. a. b. PSDN c. X.25 d. ISDNe. SDLC8. 9. It is called the picture or graphical signal. a. b. Facsimilec. Digital d. Analog e. None of the above10. 11. Which is not a key objective of developing a worldwide ISDN system? a. b. System standardizationc. Multiplexed support d. Addressing cost-related tariffs e. None of the above12. 13. Because of the obvious complexity of ISDN, it requires __________ a. Standard interface connectionb. Control system to facilitate multiplexing and demultiplexing datac. Usage of variety of protocols and applications d. Nothing14. It is a key objective of ISDN that ensure universal access to the network. a. b. Achieving transparency c. Migration d. System standardizatione. Variety of configurations15. 16. A key objective that provides a private-line(leased) and switched services a. b. Multiplexed support c. System standardization d. Variety of configurationse. Separating functions17. 18. It allows the customers to use a variety of protocols and applications.a. b. Achieving transparencyc. System standardization d. Variety of configurations e. Separating functions19. 20. It provides a service to low-capacity personal subscribers as well as to large companies a. b. Multiplexed support c. System standardization d. Variety of configurations e. Separating functions21. 22. It is a channel that is used for carrying signalling information and for exchanging network control information. a. b. D channelc. B channel d. H channel e. C channel23. 24. It is sometimes called the basic rate interface a. b. 23B + D c. 2B + Dd. 3B + D e. 32B + D25. 26. It provides multiple 64kbps channels intended to be used by the higher-volume subscribers to the network.a. b. Basic rate interface c. Access network d. Primary rate interface e. ISDN switch27. 28. It is also called as primary service.a. b. Basic rate interface c. Access network d. Primary rate interfacee. ISDN switch29. 30. An __________ routes data to an outgoing channel or central office users.a. b. Line termination c. Network termination d. Reference point e. Exchange termination31. 32. Broadband network termination isa. b. Broadband interface c. Broadband node* d. Broadband terminal e. Broadband network33. 34. The __________ data rates are used for full-motion video transmission a. b. H21 and H26 c. H26 and H22 d. H24 and H25 e. H21 and H2235. 36. A data rate that is intended for bulk data transfer.a. b. H21 c. H22 d. H23 e. H437. 38. The broadband distant terminal is responsible for __________.a. b. Electrical to optical conversion c. Multiplexing of peripherals d. Maintenance of subscriber loop system e. All of the above

ISDN blk21. ISDN stands fora. b. Internal Switch Data Networkc. Integrated Switching Digital Networkd. Integrated Services Digital Networke. Internet Services Data Nomenclature2. 3. Customers gain access to ISDN through a local interface connected to a digital transmission medium called ____________.a. b. PBXc. LANd. Digital pipee. Fiber optic

4. Typical data rates for ISDN connectiona. b. 125 kbpsc. 64 kbpsd. 32 kbpse. 16 kbps

5. Ensure universal access to the networka. b. System Standardizationc. Separating functionsd. Migratione. Multiplex6. Provide smooth transition while evolvinga. b. Separating functionc. Migrationd. Multiplexe. Variety of configuration7. 8. Allow customer to use variety of protocola. b. Achieve transparencyc. Migrationd. System Standardizatione. Multiplex9. 10. B channel of ISDNa. b. Bitc. Bearerd. Buzze. Bear11. Provides multiple 64 kbps channels to be used by higher- volume subscribers to the network.a. b. Terminal equipmentc. ISDN switchd. Network Terminatione. Primary service12. Equipment which supports standard ISDN interfacesa. b. TE1c. TE2d. TAe. Reference point

13. D channel of ISDNa. b. Datumc. Data d. Digitale. None of the above

14. Converts data from non ISDN to ISDN formatsa. b. TE1c. TE2d. TAe. Reference point

15. Used to terminate reference point Sa. b. TE1c. TE2d. NT1e. NT2

16. Service that provides transmission channels capable of supporting higher transmission ratesa. b. BISDNc. ISDNd. Internete. Broadband

17. Includes two-way exchange of informationa. b. Interactive Servicesc. Primary serviced. Network servicee. Distribution Services

18. Information transfer is primarily from service provider to subscribera. b. Interactive Servicesc. Primary serviced. Network servicee. Distribution Services

19. Provides service to ISDN terminal and broadband terminala. b. Subscribers premise networkc. Broadband noded. Service accesse. Distant terminal

20. Broadband node is also known asa. b. Access node c. Broadband network terminationd. Broadband terminal interfacee. Network access

21. Responsible for multiplexing and maintenance of subscriber systema. b. Feeder pointc. Service pointd. Broadcast distant terminale. Distribution interface

22. Provide bidirectional end-to-end transmissiona. b. Conversational servicesc. Distribution servicesd. Service nodee. None of the above

23. Refer to interfaces between the common carrier subscriber loop and central office loopa. b. U- reference pointc. T- reference pointd. S- reference pointe. V- reference point

ASYNCHRONOUS TRANSFER MODE blk11. It was developed in the 1980s by the ITU-T as part of BISDN.a. b. ATMc. ISDNd. TDMe. PLM2. 3. Cell size for ATM.a. b. 51c. 52d. 53e. 543. 4. Number of bytes for header in ATM.a. b. 4c. 5d. 6e. 74. 5. Number of bytes for payload in ATM.a. b. 46c. 47d. 48e. 495. 6. Exact year of development of ATM. a. b. 1989c. 1988d. 1987e. 19866. 7. ATM breaks all traffic into 53-Byte cells becausea. 53-Byte cells are the ideal size for the voice communicationb. 53-Byte cells are the ideal size for data communicationc. 53-Byte cells are the ideal size for circuit switchingd. 53-Byte cells are the compromised size for both voice and data communication7. What gives ATM network the ability to operate at different data rates and why?a. Its short, fixed length cells: Allows the prediction of the size of buffers to be used.b. Its short, fixed length cells: Enables the cells to be transported via different routes.c. Its short, fixed length cells: Short delays for voice traffic.d. Its short, 5-Byte header: Less delay for routing the cells.8. Why is ATM the goal for future networking?a. It is efficient for data transfer.b. It's the only technology suitable for transmission of digital television.c. It allows the integration of voice, data and video into one network.d. It creates an error free network.9. Which of the following is done in the physical layer of the ATM network?a. Cell multiplexing and demultiplexingb. Generic flow controlc. Transmission frame generation/recoveryd. Monitoring of the user information field for bit errors and possible corrective actions10. ATM is said to be a connection oriented technology. What does this mean and why is it necessary?a. Cells travel through the same path to the receiver. By this, cells do not have to be rearranged.b. Cells travel through different paths. Therefore cells can reach the receiver faster.c. A path is reserved exclusively for one user. Arrangement of cells is not necessary.d. Cells are transmitted using fiber optic cables. Cells would be less susceptible to errors.11. Which of the following is not the benefit of an ATM LAN?a. Better performance concerning with delaysb. Very high aggregate throughputc. Interconnecting existing LANsd. Simpler control and network management12. What advantage does ATM have over STM?a. Unlike ATM, time slots provided by STM for a particular user cannot be grabbed by another user.b. It is cheaper to implement.c. ATM is suitable for real time traffic but not ATMd. Time slots for STM occur at regular intervals.13. A __________ is defined as a small, fixed-size block of information.a. b. Framec. Packetd. Celle. None of the above14. 15. The ATM standard defines __________ layers.a. b. twoc. threed. foure. five15. 16. __________ eliminates the varying delay times associated with different-size packets.a. b. X.25c. Frame Relayd. ATMe. all of the above16. 17. A(n) __________ is the interface between a user and an ATM switch.a. b. UNIc. NNId. NNNe. None of the above17. 18. __________ is the interface between two ATM switches.a. b. UNIc. NNId. NNNe. none of the above18. 19. In ATM, the __________ layer accepts transmissions from upper-layer services and maps them into ATM cells.a. b. physicalc. ATMd. AALe. none of the above19. 20. In ATM, the __________ layer provides routing, traffic management, switching, and multiplexing services.a. b. physicalc. ATMd. AALe. none of the above20. 21. In ATM, the __________ layer defines the transmission medium, bit transmission, encoding, and electrical-to-optical transformation.a. b. physicalc. ATM layerd. AALe. none of the above

Asynchronous Transfer Mode blk21) ATM stands for: A. Asynchronous Tramway MachineB. Asynchronous Transfer ModeC. Automated Transfer ModeD. Automated Transfer Machine2) It is merely a connection between a source and a destination, which may entail establishing several ATM links between local switching centers. A. Virtual channelB. Virtual pathC. Labeled channelD. Labeled path3) It is a group of virtual channels connected between two points that could compromise several ATM links. A. Virtual channelB.Virtual pathC. Labeled channelD. Labeled path4) ATM incorporates ________ that are transferable at fixed data rates anywhere from 16kbps up to the maximum rate of the carrier system. A. Virtual channelB. Virtual pathC. Labeled channelsD. Labeled path5) Once data have entered the network, they are transferred into fixed time slots called _____. A. PathsB. ChannelsC. HeadersD.Cells6) It uses the first four bits of the first byte of the header field. A. Generic Control Flow FieldB.Payload Type IdentifierC. Cell Loss PriorityD. Header Error Control7) VPI stands for: A. Viral Path IdentifierB.Virtual Path IdentifierC. Viral Payload IdentifierD. Virtual Payload Identifier8) The first three bits of the second half of byte 4 specify the type of message in cell.A. Generic Control Flow FieldB. Payload Type IdentifierC. Cell Loss PriorityD. Header Error Control9) It is set by the user or cleared by the user. A. Generic Control Flow FieldB. Payload Type IdentifierC. Cell Loss PriorityD. Header Error Control10) It provides some protection against the delivery of cells to the wrong destination address.A. Generic Control Flow FieldB. Payload Type IdentifierC. Cell Loss PriorityD. Header Error Control11) AAL stands for: A. Asynchronous Adaptive LayerB.ATM Adaptation LayerC. Alternate Adaptation LayerD. Asynchronous Adaptation Layer12) This is a type of AAL which is designed to accommodate PCM-TDM traffic, which allows the ATM network to emulate voice or DSN services. A. Constant Bit RateB. VBR timing-sensitive servicesC. Connection-oriented VBR data transferD. Connectionless VBR data13) This type of AAL is reserved for future data services requiring transfer of timing information between terminal points as well as data.A. Constant Bit RateB. VBR timing-sensitive servicesC. Connection-oriented VBR data transferD. Connectionless VBR data14) Type 3 information fields transfer VBR data such as impulse data generated at irregular intervals between two subscribers over a pre-established data linkA. Constant Bit RateB. VBR timing-sensitive servicesC. Connection-oriented VBR data transferD. Connectionless VBR data15) This AAL type provides for transmission of VBR data that does not have a pre-established connection. A. Constant Bit RateB. VBR timing-sensitive servicesC. Connection-oriented VBR data transferD. Connectionless VBR data16) These are the source and destination of subscriber data. A. ATM pathsB. ATM endpointsC. ATM channelsD. ATM switches17) Its primary function is to route information from a source endpoint to a destination endpoint.A. ATM pathsB. ATM endpointsC. ATM channelsD.ATM switches18) It is simply a portion of a public service providers switching system where the service provider could be a local telephone company or a long-distance carrier. A. Private ATM switch B. Public ATM switchC. Commercial ATM switch D. Government ATM switch19) These switches are owned and maintained by a private company. A. Private ATM switchesB. Public ATM switchesC. Commercial ATM switchesD. Government ATM switchers20) ATM switches and ATM endpoints are interconnected with physical communication paths called ________. A. Transmission pathsB. Transmission endpointsC. Transmission channelsD. Transmission switches

ETHERNET blk11. Commonly known as fast Ethernet a. b. 10Base-T c. 10Base-5 d. 100Base-FL e. 100Base-T2. 3. Approximate propagation velocity along the cable in 10Base-5 a. b. 3x10^8 m/s c. 2x10^8 m/s d. 2.5x10^8 m/s e. 1.2x10^8 m/s4. 5. Sometimes called thicknet a. b. 10Base-2 c. 10Base-3 d. 10Base-4 e. 10Base-56. 7. Transmission media used by 10Base-2a. b. RG-11 c. RG-22 d. RG-58 e. RG-258. 9. Another name for 10Base-2a. b. thicknet c. bagnet d. cheapernet e. mahalnet10. 11. Maximum distance between two nodes in 10Base-5 a. b. 1 km c. 1.5 km d. 2 kme. 2.5 km12. 13. Most popular 10-Mbps Ethernet a. b. 10Base-2 c. 10Base-FL d. 10Base-5 e. 10Base-T14. 15. In 10Base-FL, FL stands for __________.a. b. fiber link c. first link d. flat link e. flipped link16. Most common 100-Mbps Ethernet standard a. b. 100Base-T4 c. 100Base-TX d. 100Base-FL e. 100Broad-T17. 18. Physical topology used in 100Base-TX a. b. mesh c. bus d. star e. tree19. 20. Two most popular frame formatsa. b. IEEE 802.3 & Ethernet I c. IEEE 803.3 & Ethernet II d. IEEE 802.2 with Snap & DIX 1.0 e. Ethernet II and IEEE 802.321. 22. LLC stands for: a. b. Link to Link Controlc. Logical Link Controld. Linked Logic Control e. Lagpak nang Lagpak sa Comms23. Also called vampire tapa. b. AUI c. MAU d. MIAU e. MAUI24. 25. Original Ethernet designed by Metcalfe and Boggsa. b. Alto Aloha Networkc. Hawaiian Network d. Cisco Networke. Drug Network26. 27. IEEE standard used to define full-duplex Ethernet operation a. b. 802.3x c. 802.3y d. 802.3z e. 802.3 u28. 29. Consists of 8 bytes of alternating 1s and 0s; Used to establish clock synchronization a. b. FCS field c. Start of Frame delimiterd. Preamble e. Source Address30. 31. Field used for error correction a. b. Preamble c. FCS field d. rice field e. football field32. 33. Replaced the type field in Ethernet frame a. b. LLC field c. Length field d. EOF delimiter e. Start field34. 35. Ethernet II frame field that contains the information a. b. Length field c. Information field d. Data field e. Start field36. 37. IEEE standard which defined the 1000-Mbps Ethernet a. b. 802.3xc. 802.2x d. 803.2z e. 802.3z

Ethernet blk2. Baseband transmission designed by Robert Metalfe and Dabid Boggs in 1972.

a. LANb. Ethernetc. Internetd. 10 Mbps Ethernet

2. It uses a bus topology and allows a maximum of 5 segments.

a. 10 Base-FLb. 10 Base-3c. 10 Base-2d. 10 Base-T

3. Defined as the Fiber Optic Inter-Repeater Link (FOIRL) that uses two fiber optic cables to extend the maximum distance between 10 Mbps repeaters to 1000 meters.

a. IEEE 802.3db. IEEE 802.3ec. IEEE 802.3ud. IEEE 802.3x

4. Formal title of IEEE 802.3

a. CSMA/CDb. DIX 2.0c. 10 Base-2d. 10 Base-36

5. 10 Mbps transmission rate over simple category 3 UTP cable.

a. 10 Base-5b. 10 Base-Tc. 10 Base-2d. 10 Base-36

6. This version of Ethernet is commonly known as fast Ethernet.

a. 10 Mbps Ethernetb. 100 Mbps Ethernetc. 1000 Mbps Ethernetd. 10 Gbps Ethernet

7. What is the maximum number of cable segments supported by the 10 Base-5 Ethernet?

a. 3b. 4c. 5d. 6

8. It has a maximum segment length of 500 meters.

a. 10 Base-5b. 10 Base-2c. 10 Base-Td. 10 Broad-36

9. Another name for the 10 Base-5 Ethernet.

a. Gigabit Ethernetb. Fast Ethernetc. Cheapernetd. Frozen Yellow Garden Hose

10. An external device used to connect terminals to the cable.

a. Dropb. Attachment unit interfacec. Thinwired. Media access unit

11. It is the most popular 10 Mbps Ethernet commonly used with PC-based LAN environment utilizing star topology.

a. 10 Base-2b. 10 Base-5c. 10 Base-Td. 10 Base-FL

12. It is the most common 10 Mbps Ethernet that uses optical fiber for the transmission medium.

a. 10 Base-FL Ethernetb. 10 Base-5c. 10 Base-FPd. 10 Base-FB

13. It is a physical layer standard specifying 100 Mbps data rates using two pairs of category 3,4 or 5 UTP or STP cable.

a. 100 Base-Tb. 100 Base-TXc. 100 Base-FXd. 100 Base-T4

14. It is a physical layer standard specifying 100 Mbps data rates over two optical fiber using a star topology.

a. 100 Mbps-Tb. 100 Mbps-TXc. 100 Mbps-FXd. 100 Mbps-T4

15. The latest implementation of Ethernet that is used to provideba fat pipe fot high-density backbone connectivity.

a. 10 Mbpsb. 100 Mbpsc. 1 Gbpsd. 10 Gbps

16. Consists of 8 bytes to establish clock synchronization.

a. Preambleb. Start frame delimiterc. Type fieldd. Data field

17. Its purpose is to mark the end of the preamble and the beginning of the data frame.

a. Preambleb. Start frame delimiterc. Type fieldd. Data field

18. This field contains 32 bits for error detection and is computed from the header and data fields.

a. Type fieldb. Data fieldc. Length fieldd. Frame check sequence field

19. It contains the informationand can be between 46 bytes and 1500 bytes long.

a. Source addressb. Destination addressc. Type fieldd. Data field

20. It corresponds to the address of the station sending the frame.

a. Destination addressb. Source addressc. End of frame delimiterd. Start frame delimiter

Frame Relay blk21. Frame Relay virtual circuits are identified by data-link connection identifiers (DLCIs). a. b. Discard Eligibityc. Congestion- Control Mechanismd. Local Management Interfacee. Data-Link Connection Identifiers2. 3. DLCI values typically are assigned by the Frame Relay ______________.a. b. Governmentc. Service providerd. Usere. None of the above

4. It is controlled by a single bit contained in the Frame Relay frame header:a. b. FECNc. BECNd. a & be. None of the above

5. The FECN mechanism is initiated when a DTE device sends Frame Relay frames into the ____________.a. b. Serverc. Networkd. DCE devicee. DTE device

6. The Discard Eligibility (DE) bit is used to indicate that a frame has __________ importance than other frames.a. b. Lowerc. Higherd. Equale. None of the above

7. Frame Relay uses a common error-checking mechanism known as the ____________________.a. Cyclic Redundancy Checkingb. Longitudinal Redundancy Checkingc. Vertical Redundancy Checkingd. Hamming Bits8. LMI virtual circuit status messages provide communication and synchronization between Frame Relay _____________ device(s).a. b. DTEc. DCEd. a & be. None of the above

9. It delimits the beginning and end of the frame. The value of this field is always the same and is represented either as the hexadecimal number 7E or as the binary number 01111110.a. b. Flagsc. Address d. Datae. FCS

10. The ________ is the bit that follows the most significant DLCI byte in the Address field.a. b. C/Rc. EAd. DLCIe. DE

11. The Congestion Control consists of 3 bits that control the frame relay congestion mechanisms. These are the ____, ______, and ______ bits.a. b. FECN, BECN, EAc. BECN,DE,EAd. FECN,BECN,DEe. C/R,FECN,BECN

12. It ensures the integrity of transmitted data.a. b. Datac. Frame Check Sequenced. Flagse. Address

13. The LMI-specific DLCI value defined in the LMI consortium specification is DLCI = _____.a. b. 1021c. 1022d. 1023e. 1024

14. Always contains a value indicating that the frame is an LMI frame.a. b. Protocol Discriminatorc. Call Referenced. LMI DLCIe. Fag

15. ________ contains a variable number of individual information elements (IEs).a. b. Message typec. Call referenced. Protocol discriminatore. Information Elements

16. ___________ is a high-performance WAN protocol that operates at the physical and data link layers of the OSI reference model.a. b. Frame Relayc. x.25d. XMODEMe. ISDN

17. ___________ are used for more efficient and flexible data transfers. These packets are switched between the various segments in the network until the destination is reached.a. b. Statistical multiplexingc. Variable-length packetsd. ISDNe. Frame relay

18. ___________ are temporary connections used in situations requiring only sporadic data transfer between DTE devices across the Frame Relay network.a. b. Permanent Virtual Circuitsc. Data Transferd. Switched Virtual Circuitse. Data-Link Connection Identifier

19. Frame Relay often is described as a streamlined version of ____________.a. b. X.25c. XMODEMd. ISDNe. PSDN

20. Considered to be terminating equipment for a specific network.a. b. DCEc.