Question 1

Which command will show you the IOS version running on your router?

Accepted Answer

The best answer is show version, which shows you the IOS file running currently on your router. The show flash command shows you the contents of flash memory, not which file is running.

Question 2

What does the command o/r 0x2142 provide?

Accepted Answer

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.

Question 3

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

Accepted Answer

The command copy tftp flash will allow you to copy a new IOS into flash memory on your router.

Question 4

A network administrator wants to upgrade the IOS of a router without removing the image currently installed. What command will display the amount of memory consumed by the current IOS image and indicate whether there is enough room available to hold…

Accepted Answer

The show flash command will provide you with the current IOS name and size and the size of flash memory.

Question 5

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?

Accepted Answer

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.

Question 6

You copy a configuration from a network host to a router's RAM. The configuration looks correct, yet it is not working at all. What could the problem be?

Accepted Answer

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.

Question 7

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

Accepted Answer

To keep open one or more Telnet sessions, use the Ctrl+Shift+6 and then X keystroke combination.

Question 8

The corporate office sends you a new router to connect, but upon connecting the console cable, you see that there is already a configuration on the router. What should be done before a new configuration is entered in the router?

Accepted Answer

Before you start to configure the router, you should erase the NVRAM with the erase startup-config command and then reload the router using the reload command.

Question 9

You need to gather the IP address of a remote switch that is located in Hawaii. What can you do to find the address?

Accepted Answer

Although option A is certainly the "best" answer, unfortunately option D will work just fine and your boss would probably prefer you to use the show cdp neighbors detail command.

Question 10

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

Accepted Answer

The best answers, the ones you need to remember, are that either an access control list is filtering the Telnet session or the VTY password is not set on the remote device.

Question 11

Which three commands can be used to check LAN connectivity problems on a router? show interfaces show ip route tracert ping dns lookups

Accepted Answer

The tracert command is a Windows command and will not work on a router! A router uses the traceroute command.

Question 12

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

Accepted Answer

Since the question never mentioned anything about a suspended session, you can assume that the Telnet session is still open, and you would just type exit to close the session.

Question 13

You telnet into a remote device and type debug ip rip, but no output from the debug command is seen. What could the problem be?

Accepted Answer

To see console messages through your Telnet session, you must enter the terminal monitor command.

Question 14

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

Accepted Answer

To copy the IOS to a backup host, which is stored in flash memory by default, use the copy flash tftp command.

Question 15

Which command displays the configuration register setting?

Accepted Answer

The show version command provides you with the current configuration register setting.

Question 16

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

Accepted Answer

The default configuration setting of 0x2102 tells the router to look in NVRAM for the boot sequence.

Question 17

What should the configuration register value be after you successfully complete the password recovery procedure and return the router to normal operation?

Accepted Answer

All Cisco routers have a default configuration register setting of 0x2102, which tells the router to load the IOS from flash memory and the configuration from NVRAM.

Question 18

You save the configuration on a router with the copy running-config startup-config command and reboot the router. The router, however, comes up with a blank configuration. What can the problem be?

Accepted Answer

If you save a configuration and reload the router and it comes up either in setup mode or as a blank configuration, chances are you have the configuration register setting incorrect.

Question 19

What information is displayed by the show hosts command? Temporary DNS entries The names of the routers created using the hostname command The IP addresses of workstations allowed to access the router Permanent name-to-address mappings created using…

Accepted Answer

The show hosts command provides information on temporary DNS entries and permanent name-to-address mappings created using the ip host command.

Question 20

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? TFTP server software must be running on the router. TFTP server software must …

Accepted Answer

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.

Managing a Cisco Internetwork Questions