Take Assessment - DsmbISP Final Exam - CCNA Discovery: Working at a Small-to-Medium Business or ISP (Version 4.1) May 14, 2009 1 What are two purposes of DNS? (Choose two.) to dynamically assign IP addressing information to network hosts to simplify the administration of host and default gateway addressing on client computers to assign TCP port numbers to hosts as part of the data transfer process to resolve human-readable domain names to numeric IP addresses to replace the static HOSTS file with a more practical dynamic system 2
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Take Assessment - DsmbISP Final Exam - CCNA Discovery: Working at a Small-to-Medium Business or ISP (Version 4.1) May 14, 2009
1 What are two purposes of DNS? (Choose two.)
to dynamically assign IP addressing information to network hosts
to simplify the administration of host and default gateway addressing on client computers
to assign TCP port numbers to hosts as part of the data transfer process
to resolve human-readable domain names to numeric IP addresses
to replace the static HOSTS file with a more practical dynamic system
Refer to the exhibit. The network administrator uses the command below to configure a default route on RTB:
RTB(config)# ip route 0.0.0.0 0.0.0.0 fa0/0
A ping issued from PC3 is successful to RTB. However, echo request packets arrive at PC1 but the echo replies do not make it back to PC3. What will fix this problem?
RTA must be configured to forward packets to the 192.168.2.0 network.
The ip route command needs to be edited so that the next hop address is 10.1.1.5.
The ip route command needs to be edited so that the 192.168.2.1 address is the next hop address.
The ip route command should be removed from the RTB router configuration.
Another default route should be configured on RTA with a next hop address of 10.1.1.6.
3
Refer to the exhibit. A NOC technician at an ISP enters the command c:\ping 209.165.201.7. What are two reasons to use this command? (Choose two.)
map the path to 209.165.201.7
test reachability to 209.165.201.7
locate connectivity problems along the route to 209.165.201.7
identify ISPs that interconnect the NOC and remote host with IP 209.165.201.7
measure the time that packets take to reach 209.165.201.7 and return to the technician's workstation
How does TCP ensure the reliable transfer of data?
If data segments are not received from the source, the destination requests that the segments be resent.
If an acknowledgment of the transmitted segments is not received from the destination in a predetermined amount of the time, the source resends the data.
TCP uses the SYN-ACK portion of the three-way handshake to ensure that all data has been received.
The TCP Protocol Interpreter process verifies the transmitted data at source and destination.
A new router is connected to an existing network. Which two tasks must be completed on the new router to include it in the dynamic routing process? (Choose two.)
Enter the new network IP address on all existing routers.
Assign an appropriate IP address and subnet mask to the serial interface.
Update the ip host configuration information with the device name and new interface IP address.
Configure a routing protocol with the directly connected network IP addresses.
Configure a routing protocol to include all networks from all existing routers.
When customers use credit cards to make purchases at a small business, a modem is heard dialing a telephone number to transfer the transaction data to the central office. What type of WAN serial connection is in use?
A hacker attempts to reach confidential information that is stored on a server inside the corporate network. A network security solution inspects the entire packet, determines that it is a threat, and blocks the packet from entering the inside network. Which security measure protected the network?
A network administrator is configuring a DTE serial interface on a 1841 router. The serial interface is installed in the first controller, second slot, first port, with an IP address from the 192.168.1.8 /30 network. Which set of commands correctly configures this interface?
Router(config)# interface serial 0/0/0Router(config-if)# ip address 192.168.1.10 255.255.255.252Router(config-if)# clock rate 64000Router(config-if)# no shutdown
Router(config)# interface serial 0/1/1Router(config-if)# ip address 192.168.1.10 255.255.255.252Router(config-if)# clock rate 64000Router(config-if)# no shutdown
Router(config)# interface serial 0/1/0Router(config-if)# ip address 192.168.1.10 255.255.255.252Router(config-if)# no shutdown
Router(config)# interface serial 1/2/1Router(config-if)# ip address 192.168.1.10 255.255.255.252Router(config-if)# no shutdown
A company is developing an Internet store for its website. Which protocol should be used to transfer credit card information from customers to the company web server?
Refer to the exhibit. The diagram that is shown represents the network of a manufacturing company with its headquarters at one end of a city and its warehouse at the other end. These two locations are connected via a T1 line. How will the Fohi router dynamically learn routes to the 192.168.16.16/28, 192.168.16.32/28, and 192.168.16.64/28 subnetworks?
Refer to the exhibit. The network administrator has configured the RTA and RTB interfaces. In order to allow hosts that are attached to RTA to reach the server that is attached to RTB, a static route from RTA to the server LAN and a default route from RTB back to RTA need to be configured. Which two commands will the administrator use to accomplish these tasks on the two routers? (Choose two.)
RTA(config)# ip route 10.16.10.5 255.255.255.252 10.16.10.6
RTA(config)# ip route 0.0.0.0 0.0.0.0 10.16.10.6
RTA(config)# ip route 10.16.10.96 255.255.255.252 10.16.10.6
RTB(config)# ip route 10.16.10.6 255.255.255.248 10.16.10.6
RTB(config)# ip route 0.0.0.0 0.0.0.0 S0/0/1
RTB(config)# ip route 0.0.0.0 0.0.0.0 10.16.10.6
22 What are three characteristics of the TCP protocol? (Choose three.)
exchanges datagrams unreliably
is used to send IP error messages
forces the retransmission of unacknowledged packets
creates a virtual session between end-user applications
carries the IP address of the destination host in the TCP header
is responsible for breaking messages into segments and reassembling them at their destination
A user is attempting to do an http://www.cisco.com/ without success. Which two configuration values must be set on the host to allow this access? (Choose two.)
A network administrator is asked to design a system to allow simultaneous access to the Internet for 250 users. The ISP can only supply five public IP addresses for this network. What technology can the administrator use to accomplish this task?
A client at a workstation with IP address 192.168.1.201/24 connects to a web server with IP address 192.168.1.254/24. Which two statements describe the transmission of a request for a web page as it is sent from the web browser to the web server? (Choose two.)
The transport layer protocol is TCP.
The source socket is 192.168.1.201:80.
The destination socket is 192.168.1.254:80.
The destination port is a number higher than 1024.
The request is sent as a response to a transmission from the server.
Refer to the exhibit. The network administrator needs to configure the Fa0/0 interface of RTB so that hosts from RTA can connect to the server that is attached to RTB. Which two commands will the administrator use to accomplish this task? (Choose two.)
RTB# ip address 192.168.102.98 255.255.255.248
RTB(config-if)# ip address 192.168.102.99 255.255.255.252
RTB(config)# ip address 192.168.102.97 255.255.255.252
RTB(config)# no shutdown
RTB(config-if)# no shutdown
RTB(config-if)# ip address 192.168.102.97 255.255.255.252
Refer to the exhibit. Which combination of cables and symbols is correct?
A - crossover, B - straight-through, C - straight-through
A - crossover, B - rollover, C - straight-through
A - straight-through, B -crossover, C - straight-through
A - straight-through, B -straight-through, C - straight-through
A - straight-through, B - straight-through, C - crossover
A - rollover, B - straight-through, C - straight-through
28 A network technician is using a network management station to gather data about the performance of devices and links within the ISP. Which application layer protocol makes this possible?
Refer to the exhibit. A ping 192.168.1.20 command is issued on workstation A to determine if workstation B can be reached. What two events will occur if this command is successful? (Choose two.)
The router will reply to the echo request with a proxy ping response.
Workstation A will send a UDP ping request message to workstation B.
The router will send a TCP acknowledgment message to workstation A.
Workstation B will send a UDP ping reply message to the router.
Workstation A will send an ICMP echo request message to workstation B.
Workstation B will send an ICMP echo reply message to workstation A.
33
Refer to the exhibit. Based on the output of the show ip route command, how many hops are between this router and the 192.168.3.0 network?
Which two commands ensure that any password that permits access to the privileged EXEC mode is not shown in plain text when the configuration files are displayed? (Choose two.)
A customer reports connectivity problems to an ISP technician. Upon questioning the customer, the technician discovers that all network applications are functioning except for FTP. What should the technician suspect is the problem?
misconfigured firewall
bad port on switch or hub
misconfigured IP addressing on the customer's workstation
wrong DNS server configured on the customer's workstation
wrong default gateway configured on the customer's workstation
The show ip route command was executed on one of the routers shown in the graphic and the following output was displayed:
C 192.168.4.0/24 is directly connected, Serial0/0R 192.168.5.0/24 [120/1] via 192.168.4.2, 00:00:19, Serial0/0R 192.168.1.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1R 192.168.2.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1C 192.168.3.0/24 is directly connected, Serial0/1
From which router was this command executed?
A
B
C
D
41
Refer to the exhibit. The network administrator of the building in the graphic needs to choose the type of cable best suited to add ServerB to the network. Which cable type is the best choice?
Refer to the exhibit. A new branch office has been added to the corporate network and a new router is to be installed to allow branch office users to access the database server at headquarters. How should the serial 0/0/0 interface of the new branch office router be configured to connect to the headquarters router?
branch_23(config-if)# ip address 192.168.5.19 255.255.255.240branch_23(config-if)# no shutdown
branch_23(config-if)# encapsulation hdlcbranch_23(config-if)# ip address 192.168.5.25 255.255.255.240branch_23(config-if)# no shutdown
branch_23(config-if)# encapsulation pppbranch_23(config-if)# no shutdown
branch_23(config-if)# encapsulation pppbranch_23(config-if)# ip address 192.168.5.33 255.255.255.240
branch_23(config-if)# encapsulation pppbranch_23(config-if)# ip address 192.168.5.21 255.255.255.240branch_23(config-if)# no shutdown
45 A Catalyst switch is used as a temporary replacement for another switch that needs to be repaired. About a minute after the switch has started, the SYST LED on the front of the switch transitions from blinking green to amber. What is the meaning of the amber SYST LED?
The switch has no configuration file in NVRAM.
The switch has failed POST and must be sent for service.
Refer to the exhibit. A user who is connected to RTA is trying to telnet to RTB, but the connection is failing. Based on the output of the show running-config command on router RTB, why is the Telnet session failing?
Telnet has not been configured on the console line.
The login command has not been issued on the console line.
No password has been configured on the VTY lines.
A session limit has not been configured for Telnet.
Refer to the exhibit. Which subnet mask would accommodate the number of hosts indicated for all subnets if the major network address was 192.168.25.0/24?
255.255.0.0
255.255.224.0
255.255.255.0
255.255.255.224
255.255.255.240
255.255.255.248
50 Which two protocols allow network devices to report their status and events to a centralized network management device? (Choose two.)
A user reports being unable to access the Internet. The help desk technician employs a bottom-up approach to troubleshooting. The technician first has the user check the patch cable connection from the PC to the wall, and then has the user verify that the NIC has a green link light. What will the technician have the user do next?
Enter an IP address into the WWW browser address bar to see if DNS is at fault.
Use traceroute to identify the device along the path to the ISP that may be at fault.
Verify the IP address, subnet, and gateway settings using ipconfig on the PC.
Connect to the user home router to check firewall settings for blocked TCP ports.
Refer to the exhibit. Both R1 and R2 are performing static NAT translations for their inside networks. A packet is sent from HostA to the web server. What are the source and destination IP addresses when the frame is located at position "A" as displayed in the exhibit?
Source: 10.1.1.2 Destination: 172.30.20.100
Source: 10.1.1.2 Destination: 192.168.1.2
Source: 172.30.20.1 Destination: 172.30.20.2
Source: 172.30.20.10 Destination: 172.30.20.100
Source: 172.30.20.10 Destination: 192.168.1.2
56 What is used by a routing protocol to determine the best path to include in the routing table?
Refer to the exhibit. A network administrator is troubleshooting the serial connection between R1 and R2. There is no communication between R1 and R2. Based on the output of the show ip interface brief command, what is the cause of the problem?