Managing a Cisco Internetwork Questions and Answers

Q: What information is displayed by the show hosts command? 1.Temporary DNS entries 2.The names of the routers created using the hostname command 3.The IP addresses of workstations allowed to access the router 4.Permanent name-to-address mappings created using the ip host command 5.The length of time a host has been connected to the router via Telnet

Correct answer: 1 and 4show hosts displays the router’s name resolution table, which holds two kinds of entry: permanent mappings entered with ip host, and temporary entries cached from DNS lookups. It says nothing about other routers’ hostnames, nothing about which workstations may access the router, and nothing about Telnet session durations - the last of those comes from show users.

Q: You are unsuccessful in telnetting into a remote device. What could the problem be? 1.IP addresses are incorrect. 2.Access control list is filtering Telnet. 3.There is a defective serial cable. 4.The VTY password is missing.

Correct answer: All of the aboveThe question asks what the problem could be, and every one of the four would prevent the session. Wrong addressing or a defective serial cable break the path to the device; an access list filtering TCP 23 blocks the connection at the router; and a VTY line with no password set refuses the connection outright, answering “password required, but none set”. That last case is the one most often overlooked, because the network is working perfectly and the router still declines.

Q: Which three commands can be used to check LAN connectivity problems on a router? 1.show interfaces 2.show ip route 3.tracert 4.ping 5.dns lookups

Correct answer: 1 ,2 and 4show interfaces reports the line and protocol status and the error counters, show ip route confirms the router knows a path to the destination, and ping tests reachability end to end. tracert is the Windows command - IOS uses traceroute - and DNS lookups test name resolution rather than connectivity.

Q: If you want to have more than one Telnet session open at the same time, what keystroke combination would you use?

Correct answer: Ctrl+Shift+6, then XCtrl+Shift+6 followed by X suspends the current Telnet session and returns to the local router prompt, leaving the session open in the background. show sessions then lists the suspended sessions and typing their number resumes one, so several can be held open at once. It is the same escape sequence used to interrupt a long-running command.

Q: Which command will copy the IOS to a backup host on your network?

Correct answer: copy flash tftpThe IOS image lives in flash, so backing it up copies from flash to the TFTP server. The direction is what distinguishes this from the next item: source first, destination second. copy start tftp would back up the configuration rather than the image, and copy run start saves the configuration locally.

Q: Which command loads a new version of the Cisco IOS into a router?

Correct answer: copy tftp flashLoading a new image reverses the previous command: the source is the TFTP server and the destination is flash. The router will ask whether to erase flash first, which matters because a router with too little free flash cannot hold both images - and if the erase is accepted and the transfer then fails, the router is left with no IOS and must be recovered from ROM monitor.

Q: You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault. What IOS user exec command should you issue?

The command traceroute (trace for short), which can be issued from user mode or privileged mode, is used to find the path a packet takes through an internetwork and will also show you where the packet stops because of an error on a router.

Q: You telnet to a router and make your necessary changes; now you want to end the Telnet session. What command do you type in?

Correct answer: exitexit ends the Telnet session and returns you to the device you came from; logout does the same. disconnect is typed at the originating router to close a suspended session, not at the far end, and disable merely drops from privileged to user exec mode without ending anything.

You have your laptop directly connected into a router's Ethernet port. Which of the following are among the requirements for the copy flash tftp command to be successful?

1.TFTP server software must be running on the router.

2.TFTP server software must be running on your laptop.

3.The Ethernet cable connecting the laptop directly into the router's Ethernet port must be a straight-through cable.

4.The laptop must be on the same subnet as the router's Ethernet interface.

5.The copy flash tftp command must be supplied the IP address of the laptop.

A.1, 3 and 4
B.2, 4 and 5
C.3 and 5 only
D.5 only

Answer: B

Before you back up an IOS image to a laptop directly connected to a router's Ethernet port, make sure the TFTP server software is running on your laptop, that the Ethernet cable is a "crossover," and that the laptop is in the same subnet as the router's Ethernet port, and then you can use the copy flash tftp command from your laptop.

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What information is displayed by the show hosts command?

1.Temporary DNS entries

2.The names of the routers created using the hostname command

3.The IP addresses of workstations allowed to access the router

4.Permanent name-to-address mappings created using the ip host command

5.The length of time a host has been connected to the router via Telnet

A.1, 2 and 3
B.1 and 4
C.3, 4, and 5
D.All of the above

Answer: B

Correct answer: 1 and 4

show hosts displays the router’s name resolution table, which holds two kinds of entry: permanent mappings entered with ip host, and temporary entries cached from DNS lookups. It says nothing about other routers’ hostnames, nothing about which workstations may access the router, and nothing about Telnet session durations - the last of those comes from show users.

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You are unsuccessful in telnetting into a remote device. What could the problem be?

1.IP addresses are incorrect.

2.Access control list is filtering Telnet.

3.There is a defective serial cable.

4.The VTY password is missing.

A.1 only
B.3 only
C.2 and 4 only
D.All of the above

Answer: C

Correct answer: All of the above

The question asks what the problem could be, and every one of the four would prevent the session. Wrong addressing or a defective serial cable break the path to the device; an access list filtering TCP 23 blocks the connection at the router; and a VTY line with no password set refuses the connection outright, answering “password required, but none set”. That last case is the one most often overlooked, because the network is working perfectly and the router still declines.

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Which three commands can be used to check LAN connectivity problems on a router?

1.show interfaces

2.show ip route

3.tracert

4.ping

5.dns lookups

A.1 ,2 and 4
B.2 and 5
C.3 and 5
D.None of the above

Answer: A

Correct answer: 1 ,2 and 4

show interfaces reports the line and protocol status and the error counters, show ip route confirms the router knows a path to the destination, and ping tests reachability end to end. tracert is the Windows command - IOS uses traceroute - and DNS lookups test name resolution rather than connectivity.

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If you want to have more than one Telnet session open at the same time, what keystroke combination would you use?

A.Tab+Spacebar
B.Ctrl+X, then 6
C.Ctrl+Shift+X, then 6
D.Ctrl+Shift+6, then X

Answer: D

Correct answer: Ctrl+Shift+6, then X

Ctrl+Shift+6 followed by X suspends the current Telnet session and returns to the local router prompt, leaving the session open in the background. show sessions then lists the suspended sessions and typing their number resumes one, so several can be held open at once. It is the same escape sequence used to interrupt a long-running command.

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Which command will copy the IOS to a backup host on your network?

A.transfer IOS to 172.16.10.1
B.copy run start
C.copy start tftp
D.copy flash tftp

Answer: D

Correct answer: copy flash tftp

The IOS image lives in flash, so backing it up copies from flash to the TFTP server. The direction is what distinguishes this from the next item: source first, destination second. copy start tftp would back up the configuration rather than the image, and copy run start saves the configuration locally.

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Which command loads a new version of the Cisco IOS into a router?

A.copy flash ftp
B.copy ftp flash
C.copy flash tftp
D.copy tftp flash

Answer: D

Correct answer: copy tftp flash

Loading a new image reverses the previous command: the source is the TFTP server and the destination is flash. The router will ask whether to erase flash first, which matters because a router with too little free flash cannot hold both images - and if the erase is accepted and the transfer then fails, the router is left with no IOS and must be recovered from ROM monitor.

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You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault. What IOS user exec command should you issue?

A.Router> ping
B.Router> trace
C.Router> show ip route
D.Router> show interface

Answer: B

The command traceroute (trace for short), which can be issued from user mode or privileged mode, is used to find the path a packet takes through an internetwork and will also show you where the packet stops because of an error on a router.

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The configuration register setting of 0x2102 provides what function to a router?

A.Tells the router to boot into ROM monitor mode
B.Provides password recovery
C.Tells the router to look in NVRAM for the boot sequence
D.Boots the IOS from a TFTP server

Answer: C

Correct answer: Tells the router to look in NVRAM for the boot sequence

0x2102 is the normal setting. The last digit, 2, sets the boot field so that the router reads the startup configuration in NVRAM and follows any boot system commands there; the 1 in the third position ignores the break key. Contrast 0x2142, which sets the boot field to ignore NVRAM - the setting used deliberately for password recovery.

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10.

You telnet to a router and make your necessary changes; now you want to end the Telnet session. What command do you type in?

A.close
B.disable
C.disconnect
D.exit

Answer: D

Correct answer: exit

exit ends the Telnet session and returns you to the device you came from; logout does the same. disconnect is typed at the originating router to close a suspended session, not at the far end, and disable merely drops from privileged to user exec mode without ending anything.

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