Managing a Cisco Internetwork Questions and Answers

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.

Answer: C

Correct answer: The configuration register setting is incorrect.

A blank configuration after a successful save points at the boot field: with the register at 0x2142 the router deliberately ignores NVRAM, so the saved configuration is present but never read. It is almost always the residue of a password recovery in which the register was not returned to 0x2102. show version confirms it in one line.

Answer: A

Correct answer: show flash

show flash lists the files in flash with their sizes and reports the bytes used and available, so it answers both parts of the question - how much the current image consumes and whether the free space will hold a second one. show version reports the total flash fitted but not what remains free, and the memory and buffer commands concern RAM rather than flash.

Answer: D

Correct answer: Issue the show cdp neighbors detail command on the router connected to the switch.

CDP is the tool for discovering a directly connected Cisco device you cannot otherwise reach. The plain show cdp neighbors gives the device identifier, the local and remote ports, the platform and the capabilities - but not the address. Adding detail includes the neighbour’s IP address and IOS version, which is exactly what is wanted here. show cdp entry * gives the same information.

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.

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.

Answer: C

Correct answer: 0x2102

Password recovery sets the register to 0x2142 so the router boots ignoring NVRAM and therefore ignoring the forgotten password. Once the configuration has been loaded and the password reset, the register must be returned to 0x2102 with config-register 0x2102 and the configuration saved - otherwise the router will keep ignoring its startup configuration on every reload, which is precisely the fault described in item 27926.

Answer: C

Since the configuration looks correct, you probably didn't screw up the copy job. However, when you perform a copy from a network host to a router, the interfaces are automatically shut down and need to be manually enabled with the no shutdown command.

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.

Answer: B

The default configuration setting is 0x2102, which tells the router to load the IOS from flash and the configuration from NVRAM. 0x2142 tells the router to bypass the configuration in NVRAM so that you can perform password recovery.