Question 1

Question 1

0 out of 1 points

Infrastructure system APs require a [a] to obtain their configuration.

Specified Answer for: a

application

Correct Answers for: a server

Question 2

0 out of 1 points

Autonomous system APs need to be configuredby the system [a].

Specified Answer for: a ip address

Correct Answers for: a administrator

Question 3

0 out of 1 points

A group of wireless devices that is served by a single access point is known as a [a] which is sometimes known as [b] mode.

Specified Answer for: a Basic Service Set

Specified Answer for: b

infrastructural

Correct Answers for: a BSS basice service set

Correct Answers for: b infrastructure

Question 4

0 out of 1 points

The [a] serves as the "network name" for the group of wireless devices that is served by a single AP.

Specified Answer for: a Basic Service Set

Correct Answers for: a SSID service set identifier

Question 5

0 out of 1 points

If more than one AP is required for the network to support the users, it is known as an [a].

Specified Answer for: a network

Correct Answers for: a ESS extended service set

Question 6

0 out of 1 points

Peer-to-peer or ad hoc mode is called a [a].

Specified Answer for: a

Ad Hoc

Correct Answers for: a IBSS independent basic service set

Question 1

0 out of 1 points

Which wireless device is used to connect two network segments together? Answer

Selected Answer: [None Given]

Correct Answer: bridge wireless bridge

Question 2

0 out of 1 points

What type of material is an industrial access point cover usually made of? Answer


Correct Answer: metal steel

Question 3

0 out of 1 points

An official standard controlled by a standards organization is referred to as: Answer


Correct Answer: de jure de jure standard

Question 4

0 out of 1 points

In the diagram, device 1a is set to root mode. What mode is device 3c set to? ch02_q3-4.bmp Answer


Correct Answer: non-root mode

non root mode non-root non root

Question 5

0 out of 1 points

Which standard covers wireless networks (WLAN)? Answer


Correct Answer: 802.11

Question 6

0 out of 1 points

In the diagram, device 1a is set to root mode. What mode is device 2b set to? ch02_q3-4.bmp Answer


Correct Answer: repeater repeater mode

Question 7

0 out of 1 points

The type of standard that follows common practices in the industry is referred to as: Answer


Correct Answer: de facto de facto standard

Question 8

0 out of 1 points

What number has been assigned to the project best know for establishing standards for computer networks? Answer


Correct Answer: 802

Question 9

0 out of 1 points

What is the name of the technology that sends an electrical current through unused wires of an Ethernet cable? Answer


Correct Answer: POE power over ethernet

Question 1

1 out of 1 points

At regular intervals the AP in an infrastructure network or wireless device in an ad hoc network sends a ____ frame both to announce its presence and to provide the necessary information for other devices to join the network. Answer

Selected Answer: beacon

Question 2

1 out of 1 points

An access point sends out a beacon frame containing a ____ identifying the stations that have buffered frames waiting at the access point. Answer

Selected Answer: traffic indication map

Question 3

1 out of 1 points

When an ESS is installed it is desirable to configure the areas of coverage much like cells in a cellular telephone system. Answer

Selected Answer: True

Question 4

1 out of 1 points

Why is CSMA/CD unsuitable for wireless networks? Answer

Selected Answer: Both A and B

Question 5

1 out of 1 points

On ESS networks that have multiple access points, the wireless device might actually receive beacon frames from several APs. Which AP would a wireless device generally choose in this case? Answer

Selected Answer: the one with the strongest signal strength

Question 6

1 out of 1 points

The first major function of the MAC layer involves defining procedures for a wireless device to discover the WLAN. Answer


Question 7

1 out of 1 points

The ____ field appears first in a management frame. Answer

Selected Answer: Frame control

Question 8

1 out of 1 points

Wireless authentication involves a user logging on to the access point. Answer

Selected Answer: False

Question 9

1 out of 1 points

With MobileIP, the ____ assigns the mobile computer a new (but temporary) IP number. Answer

Selected Answer: foreign agent

Question 10

1 out of 1 points

What is the first step in shared key authentication? Answer

Selected Answer: wireless device sends an authentication frame to the AP

Question 11

1 out of 1 points

The 802.11 standard provides an option that can be used when collisions occur due to a hidden node. That option is known as ____. Answer

Selected Answer: virtual carrier sensing

Question 12

1 out of 1 points

What is the default authentication method according to the 802.11 standard? Answer

Selected Answer: open system

Question 13

1 out of 1 points

The RTS/CTS protocol is especially taxing when ____ data packets are being transmitted. Answer

Selected Answer: short

Question 14

0 out of 1 points

The ____ field appears last in a data frame. Answer

Selected Answer: Duration

Question 15

1 out of 1 points

The ____ draft defines a superset of features that is intended to provide QoS over WLANs. Answer

Selected Answer: 802.11e

Question 16

1 out of 1 points

____ effectively prevents collisions because every device must wait until it receives permission before it can transmit. Answer

Selected Answer: Polling

Question 17

1 out of 1 points

Which of the following describes a wireless device switching from one AP to another? Answer

Selected Answer: handoff

Question 18

1 out of 1 points

A home agent is a forwarding mechanism that keeps track of where the mobile computer is located. Answer


Question 19

1 out of 1 points

What is the difference between passive and active scanning? Answer

Selected Answer: which device initiates the discovery

Question 20

1 out of 1 points

CSMA/CA eliminates the possibility of collisions. Answer


Question 21

1 out of 1 points

In an infrastructure network the beacon interval is normally set to ____ ms, although it can be modified. Answer

Selected Answer: 100

Question 22

1 out of 1 points

A BSS is ____. Answer

Selected Answer:

a group of wireless devices that is served by a single access point

Question 23

1 out of 1 points

When an AP accepts or rejects a wireless device it sends a(n) ____ frame. Answer

Selected Answer: association response

Question 24

1 out of 1 points

All frames contain the MAC address of the source and destination device, a frame sequence number, and a frame ____ used for error detection. Answer

Selected Answer: check sequence

Question 25

1 out of 1 points

What is the minimum number of BSS networks required to form an ESS? Answer

Selected Answer: 2

Question 26

1 out of 1 points

Following authentication, if the access point accepts the wireless device, it reserves memory space in the AP and establishes a(n) ____ ID for it. Answer

Selected Answer: association

Question 1

1 out of 1 points

What is the shape of a Fresnel zone? Answer

Selected Answer: Ellipsoidal

Question 2

1 out of 1 points

The length of an antenna should be about ____ the wavelength. Answer

Selected Answer: 1/4 of

Question 3

1 out of 1 points

Highly-directional antennas are generally concave dish-shaped devices. Answer


Question 4

1 out of 1 points

____ modulation changes the number of waves representing one cycle. Answer

Selected Answer: Frequency

Question 5

1 out of 1 points

Whenever a wave completes its trip and returns back to the starting point it has finished two cycles. Answer


Question 6

1 out of 1 points

Electromagnetic waves travel freely through space in all directions at the speed of light, or approximately ____ per second. Answer

Selected Answer: 186,000 miles

Question 7

1 out of 1 points

The term ____ describes the rate of electrical flow. Answer

Selected Answer: current

Question 8

1 out of 1 points

The ASK 1 bit has a carrier signal (positive voltage) while a 0 bit has no signal (zero voltage). Answer


Question 9

1 out of 1 points

A loss of 10 decibels means that ____ percent of the power has been lost in mW. Answer

Selected Answer: 90

Question 10

1 out of 1 points

What is the free space loss (in dB) for IEEE 802.11b and 802.11g WLANs when the distance in meters is 100? Answer

Selected Answer: 80

Question 11

1 out of 1 points

The maximum EIRP for IEEE 802.11b WLANs is ____ mW. Answer


Question 12

1 out of 1 points

A ____ dipole antenna produces a flatter signal than a standard dipole antenna. Answer

Selected Answer: high-gain

Question 13

1 out of 1 points

When a digital signal needs to be transmitted over an analog medium, such as when a computer needs to send digital signals over an analog telephone line or TV cable, a device known as a(n) ____ is used. Answer

Selected Answer: modem

Question 14

1 out of 1 points

Which of the following types of wave is imperceptible? Answer

Selected Answer: radio

Question 15

1 out of 1 points

Which type of RF loss is caused by the equipment transmitting the signal? Answer

Selected Answer: Voltage Standing Wave Ratio

Question 16

1 out of 1 points

Television uses three types of modulation. The video portion uses ____. Answer

Selected Answer: AM

Question 17

1 out of 1 points

What is a problem with measuring RF loss using a linear scale? Answer

Selected Answer: it does not reveal what the loss is in relation to the whole

Question 18

1 out of 1 points

Which digital modulation technique is similar to frequency modulation? Answer

Selected Answer: frequency shift keying

Question 19

1 out of 1 points

____ polarization is typically used in wireless LANs with the dual antennas of access points pointing upward. Answer

Selected Answer: Vertical

Question 20

1 out of 1 points

Which of the following units is used to measure frequency? Answer

Selected Answer: hertz

Question 21

1 out of 1 points

In a wireless transmission data travels on invisible radio waves. Answer


Question 22

1 out of 1 points

Which of the following is an electromagnetic wave? Answer

Selected Answer: All of the above

Question 23

1 out of 1 points

____ antennas are used for long distance, point-to-point wireless links, such as connecting buildings that are up to 42 kilometers (25 miles) apart. Answer

Selected Answer: Highly-directional

Question 24

1 out of 1 points

A basic rule of thumb is that each 6 dB increase in EIRP results in a quadrupling of the transmission range (distance from the antenna), and a 6 dB reduction in EIRP translates into reducing the range by four Answer


Question 25

1 out of 1 points

____ can occur intentionally from an external power source that amplifies the signal, or unintentionally when an RF signal bounces off an object and combines with the original signal to amplify it. Answer

Selected Answer: Gain

Question 26

1 out of 1 points

When an RF signal moves from one medium to another of a different density the signal actually bends instead of traveling in a straight line. This is known as ____. Answer

Selected Answer: refraction

Question 1

1 out of 1 points

Beginning with Windows ____, all Microsoft desktop operating systems recognize a wireless NIC without the need for any external software drivers. Answer

Selected Answer: XP

Question 2

1 out of 1 points

An access point has a(n) ____ wired network interface that allows it to connect by cable to a standard wired network. Answer

Selected Answer: RJ-45

Question 3

1 out of 1 points

Ultimately, who regulates standards that are developed by consortia? Answer

Selected Answer: the marketplace

Question 4

1 out of 1 points

If a remote wireless bridge is set to ____, it can only transmit to another bridge in root mode. Answer

Selected Answer: non-root mode

Question 5

1 out of 1 points

Which type of remote wireless bridge connection is used to connect multiple LAN segments together?

Answer

Selected Answer: point-to-multipoint

Question 6

1 out of 1 points

The IEEE 802.11 standard outlines the use of ____ transmissions for WLANs. Answer

Selected Answer: diffused infrared

Question 7

1 out of 1 points

CF cards consist of a small circuit board that contains flash memory chips and a dedicated controller chip. Answer


Question 8

1 out of 1 points

How does an access point receive electrical power if it is mounted in a location that is not close to an electrical outlet? Answer

Selected Answer:

through the unused wires in a standard unshielded twisted pair (UTP) Ethernet cable

Question 9

1 out of 1 points

When a business is registered as a ____ they are qualified be placed in an online database of wireless hotspot locations. Answer

Selected Answer: Wi-Fi Zone

Question 10

1 out of 1 points

Most bridges have what is known as ____ that minimizes the spread of the signal so that it can reach farther distances. Answer

Selected Answer: delay spread

Question 11

1 out of 1 points

What is the name for the computer network architecture standards developed by the IEEE? Answer

Selected Answer: Project 802

Question 12

1 out of 1 points

What is a disadvantage of standards? Answer

Selected Answer:

they can open domestic markets in larger countries to overseas competition

Question 13

1 out of 1 points

Which of the following statements describes the difference between a CF wireless NIC and a PC card? Answer

Selected Answer: PC card is larger than CF

Question 14

1 out of 1 points

What function is performed by a wireless gateway? Answer

Selected Answer: All of the above

Question 15

1 out of 1 points

Most industry experts recommend one access point for no more than ____ users if they are performing basic e-mail, light Web surfing, and occasionally transferring medium-sized files. Answer

Selected Answer: 50

Question 16

1 out of 1 points

Microsoft Windows has become the ____ standard operating system today for personal desktop computers and network servers. Answer

Selected Answer: de facto

Question 17

1 out of 1 points

De facto standards are not actually standards at all. Answer


Question 18

1 out of 1 points

A(n) ____ card improves input/output speed over a PC Card by increasing the bus width to 32 bits yet still supports lower-voltage PC Cards. Answer

Selected Answer: CardBus

Question 19

1 out of 1 points

The radio frequency spectrum is divided into ____ different sections or bands. Answer


Question 20

1 out of 1 points

The 802.11b standard can support wireless devices that are up to ____ meters apart. Answer


Question 21

1 out of 1 points

A device called a ____ must sometimes be attached to a PDA in order to establish a wireless connection. The device contains a slot for a wireless NIC or similar device. Answer

Selected Answer: sled

Question 22

1 out of 1 points

Which IEEE committee establishes standards for wireless wide area networks? Answer

Selected Answer: 802.16

Question 23

1 out of 1 points

If a remote wireless bridge is in repeater mode it functions as a standard AP only and does not communicate with other remote wireless bridges. Answer


Question 24

1 out of 1 points

What is another name for a NIC? Answer

Selected Answer: client network adapter

Question 25

1 out of 1 points

The IEEE 802.11g draft was a compromise based on input from several different chip (microprocessor) manufacturers, who had a major stake in the outcome. Answer


Question 26

1 out of 1 points

Only one type of wireless NIC is available for laptop computers. Answer


WWAN I. A wireless computer data network that may extend over a large geographical area. Wi-Fi Q. Term for certain types of wireless LANs that use specifications in the 802.11 family. Antenna P. Converts radio-frequency fields (RF) into alternating current (AC) or vice versa. Hot spot R. Wireless network that provides Internet connection and virtual private network access from a given location. RFID G. Incorporates the use of radio frequency to uniquely identify an object, animal, or person. Microbrowser O. Software built into a wireless device that allows users to access and display spcially formatted Internet content using a handset device. WLAN C. Local area network in which a user can connect through a radio connection. WiMAX J. Wireless industry coalition whose members organized to advance the IEEE 802.16 standard, which will enable wireless networks to transmit up to 30 miles. War driving B. The act of locating and possibly exploiting connections to wireless networks while driving around. WAP H. Specification for a set of protocols that standardize the way wireless devices, such as cellular telephones and radio transceivers, are used for Internet access. Piconet A. Formed when at least two devices, such as a portable PC and a cellular phone, connect using Bluetooth technology. Bluetooth K. Telecommunications industry specification that describes how mobile phones, computer, and personal digital assistants (PDAs) can be networked easily using a short-range (about 30 feet) connection. WPAN C. Local area network in which a user can connect through a radio connection. FSO L. Refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere to obtain broadband communications. Wireless adapter E. A card that is inserted into a device to connect it to a wireless network. GSM F. A WWAN technology used by cell phones and other handheld devices. Access point D. A wireless network for interconnecting devices centered

around an individual person's workspace. WML N. A language that allows the text portions of Web pages to be displayed on cell phones and PDAs wirelessly.

Question 1

Documents

answer selected answer

specified answer

root y question

b y question

beacon y question

ethernet y question

true y question

false y question