Chapter 6 Cisco's Internetworking Operating System (IOS)

At which layer of the OSI model would you assume the problem is if you type show interface serial 1 and receive the following message? Serial1 is down, line protocol is down A. Physical layer B. Data Link layer C. Network layer D. None; it is a router problem.

A. If you see that a serial interface and the protocol are both down, then you have a Physical layer problem. If you see serial1 is up, line protocol is down, then you are not receiving (Data Link) keepalives from the remote end.

Which of the following commands will display the current IP addressing and the layer 1 and 2 status of an interface? (Choose two.) A. show version B. show interfaces C. show controllers D. show ip interface E. show running-config

B, D. The commands show interfaces and show ip interface will show you the layer 1 and 2 status and the IP addresses of your router's interfaces.

What is the problem with an interface if you type show interface serial 0 and receive the following message? Serial0 is administratively down, line protocol is down A. The keepalives are different times. B. The administrator has the interface shut down. C. The administrator is pinging from the interface. D. No cable is attached.

B. If an interface is shut down, the show interface command will show the interface as administratively down. (It is possible that no cable is attached, but you can't tell that from this message.)

You type Router#sh ru and receive a % ambiguous command error. Why did you receive this message? A. The command requires additional options or parameters. B. There is more than one show command that starts with the letters ru. C. There is no show command that starts with ru. D. The command is being executed from the wrong router mode.

B. The % ambiguous command error means that there is more than one possible show command that starts with ru. Use a question mark to find the correct command.

Which of the following commands will configure all the default VTY ports on a router? A. Router#line vty 0 4 B. Router(config)#line vty 0 4 C. Router(config-if)#line console 0 D. Router(config)#line vty all

B. From global configuration mode, use the line vty 0 4 command to set all five default VTY lines.

You set the console password, but when you display the configuration, the password doesn't show up; it looks like this: [output cut] Line console 0 Exec-timeout 1 44 Password 7 098C0BQR Login [output cut] What command would configure the password to be stored this way? A. encrypt password B. service password-encryption C. service-password-encryption D. exec-timeout 1 44

B. The command service password-encryption, from global configuration mode, will encrypt the passwords.

Which two of the following commands are required when configuring SSH on your router? A. enable secret password B. exec-timeout 0 0 C. ip domain-name name D. username name password password E. ip ssh version 2

C, D. To configure SSH on your router, you need to set the username command, the ip domain-name, login local, and the transport input ssh under the VTY lines, and the crypto key command. However, SSH version 2 is not required, but suggested.

If you delete the contents of NVRAM and reboot the router, what mode will you be in? A. Privileged mode B. Global mode C. Setup mode D. NVRAM loaded mode

C. If you delete the startup-config and reload the router, the router will automatically enter setup mode. You can also type setup from privileged mode at any time.

Which of the following commands displays the configurable parameters and statistics of all interfaces on a router? A. show running-config B. show startup-config C. show interfaces D. show versions

C. With the show interfaces command, you can view the configurable parameters, get statistics for the interfaces on the router, verify if the interfaces are shut down, and see the IP address of each interface.

Which of the following is a correct combination of file type and default location in a Cisco router? A. IOS/NVRAM B. Startup configuration/flash memory C. IOS/flash memory D. Running configuration/NVRAM

C. The default locations of the files are IOS in flash memory, startup configuration in NVRAM, and running configuration in RAM.

Which of the following commands sets the secret password to Cisco? A. enable secret password Cisco B. enable secret cisco C. enable secret Cisco D. enable password Cisco

C. The enable secret password is case sensitive, so the second option is wrong. To set the enable secret password, use the enable secret password command from global configuration mode.

You type show running-config and get this output: [output cut] line console 0 Exec-timeout 1 44 Password 7 098C0BQR Login [output cut] What do the two numbers following the exec-timeout command mean? A. If no command has been typed in 44 seconds, the console connection will be closed. B. If no router activity has been detected in 1 hour and 44 minutes, the console will be locked out. C. If no commands have been typed in 1 minute and 44 seconds, the console connection will be closed. D. If you're connected to the router by a Telnet connection, input must be detected within 1 minute and 44 seconds or the connection will be closed.

C. The exec-timeout command is set in minutes and seconds.

Which of the following prompts indicate that the router is currently in privileged mode? A. router(config)# B. router> C. router# D. router(config-if) router(config)# -- global configuration mode router> -- user mode router# -- privileged mode router(config-if)# -- interface configuration mode

C. The prompts offered as options indicate the following modes: router(config)# -- global configuration mode router> -- user mode router# -- privileged mode router(config-if)# -- interface configuration mode

Which command will show you whether a DTE or a DCE cable is plugged into serial 0? A. sh int s0 B. sh int serial 0 C. show controllers s 0 D. show serial 0 controllers

C. The show controllers serial 0 command will show you whether either a DTE or DCE cable is connected to the interface. If it is a DCE connection, you need to add clocking with the clock rate command.

If you wanted administrators to see a message when logging into the router, which command would you use? A. message banner motd B. banner message motd C. banner motd D. message motd

C. The typical banner is a message of the day (MOTD) and is set by using the global configuration mode command banner motd.

Which command will delete the contents of NVRAM on a router? A. delete NVRAM B. delete startup-config C. erase NVRAM D. erase start

D. The erase startup-config command erases the contents of NVRAM and will put you in setup mode if the router is restarted.

You try to telnet into SFRouter from router Corp and receive this message: Corp#telnet SFRouter Trying SFRouter (10.0.0.1)...Open Password required, but none set [Connection to SFRouter closed by foreign host] Corp# Which of the following sequences will address this problem correctly? A. Corp(config)#line console 0 Corp (config-line)#password password Corp (config-line)#login B. SFRemote(config)#line console 0 Corp (config-line)#enable secret password Corp (config-line)#login C. Corp(config)#line vty 0 4 Corp (config-line)#password password Corp (config-line)#login D. SFRemote(config)#line vty 0 4 Corp (config-line)#password password Corp (config-line)#login

D. To allow a VTY (Telnet) session into your router, you must set the VTY password. Option C is wrong because it is setting the password on the wrong router. Notice that the answers you have to set the password before you set the login command. Remember, Cisco may have you set the password before the login command.

What command do you type to save the configuration stored in RAM to NVRAM? A. Router(config)#copy current to starting B. Router#copy starting to running C. Router(config)#copy running-config startup-config D. Router#copy run start

D. To copy the running-config to NVRAM so that it will be used if the router is restarted, use the copy running-config startup-config command in privileged mode (copy run start for short).

You type the following command into the router and receive the following output: Router#show serial 0/0 ^ % Invalid input detected at '^' marker. Why was this error message displayed? A. You need to be in privileged mode. B. You cannot have a space between serial and 0/0. C. The router does not have a serial0/0 interface. D. Part of the command is missing.

D. You can view the interface statistics from user mode, but the command is show interface serial 0/0.

Which of the following connection methods available to connect to a router is considered out-of-band? A. Serial port B. VTY port C. HTTP port D. Aux port

D. The auxiliary port can be configured with modem commands so that a modem can be connected to the router. It lets you dial up a remote router and attach to the auxiliary port if the router is down and you need to configure it out-of-band (meaning out of the network).