IOS and Security Device Manager Questions and Answers

Q: Which of the following commands sets the secret password to Cisco?

Correct answer: enable secret CiscoThe syntax is enable secret <password>, and everything after the keyword is taken as the password itself - so enable secret password Cisco would set the password to the two words “password Cisco”. Passwords are case sensitive, which rules out cisco, and enable password sets the older, weakly obscured password rather than the MD5-hashed secret.

Q: 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?

Correct answer: Part of the command is missing.There is no show serial command in IOS. The interface has to be reached through show interfaces, so the correct form is show interfaces serial 0/0 and the parser rejects serial as the first token it does not recognise. The space between the type and the number is perfectly legal - it appears in the correct command - and the error says nothing about whether the interface exists, since the command never got far enough to look.

Q: Which of the following commands will display the current IP addressing and the layer 1 and 2 status of an interface? 1.show version 2.show protocols 3.show interfaces 4.show controllers 5.show ip interface

Correct answer: 2, 3 and 5show protocols lists each interface with its address and its line and protocol status; show interfaces gives the same information with a great deal more detail; and show ip interface gives it per interface with the IP-specific settings. show version reports the software and hardware, and show controllers reports the physical layer at the controller level - useful for identifying a DTE or DCE cable, but it carries no IP addressing.

Q: Which of the following commands displays the configurable parameters and statistics of all interfaces on a router?

Correct answer: show interfacesshow interfaces reports every interface in turn with its configurable parameters and its running counters - status, encapsulation, addressing, load, errors and resets. The two configuration commands show what was configured rather than what is happening, and there is no show versions with an s.

Q: Which of the following commands will configure all the default VTY ports on a router?

Correct answer: Router(config)#line vty 0 4Two things must be right: the mode and the range. VTY lines are configured from global configuration mode, not from privileged exec and not from interface configuration mode, and the five default lines are numbered 0 to 4. There is no all keyword, and line console 0 configures a different line entirely.

Q: You need to find the broadcast address used on a LAN on your router. What command will you type into the router from user mode to find the broadcast address?

The command show ip protocols will actually show you the broadcast address for each interface - too bad it isn't a possible answer. Your best answer is show interfaces, which will provide the IP address and mask for each interface.

Q: Which command will delete the contents of NVRAM on a router?

Correct answer: erase starterase startup-config, abbreviated erase start, deletes the saved configuration held in NVRAM. There is no delete NVRAM or erase NVRAM command - the region is addressed through the file it holds. After the erase the running configuration is untouched, so nothing changes until the router is reloaded.

Q: What keystroke will terminate setup mode?

Correct answer: Ctrl+CCtrl+C aborts the setup dialogue and drops the router to the command line prompt with no configuration applied. Ctrl+Z ends configuration mode rather than setup, and Ctrl+Shift+6 is the break sequence used to interrupt a running command such as a long trace.

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

Answer: C

Correct answer: enable secret Cisco

The syntax is enable secret <password>, and everything after the keyword is taken as the password itself - so enable secret password Cisco would set the password to the two words “password Cisco”. Passwords are case sensitive, which rules out cisco, and enable password sets the older, weakly obscured password rather than the MD5-hashed secret.

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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.

Answer: B

Correct answer: Part of the command is missing.

There is no show serial command in IOS. The interface has to be reached through show interfaces, so the correct form is show interfaces serial 0/0 and the parser rejects serial as the first token it does not recognise. The space between the type and the number is perfectly legal - it appears in the correct command - and the error says nothing about whether the interface exists, since the command never got far enough to look.

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Which of the following commands will display the current IP addressing and the layer 1 and 2 status of an interface?

1.show version

2.show protocols

3.show interfaces

4.show controllers

5.show ip interface

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

Answer: B

Correct answer: 2, 3 and 5

show protocols lists each interface with its address and its line and protocol status; show interfaces gives the same information with a great deal more detail; and show ip interface gives it per interface with the IP-specific settings. show version reports the software and hardware, and show controllers reports the physical layer at the controller level - useful for identifying a DTE or DCE cable, but it carries no IP addressing.

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You type show running-config and get this output:What do the two numbers following the exec-timeout command mean?

[output cut]
Line console 0
    Exec-timeout 1 35
    Password BIXPASSWD
    Login
[output cut]

What do the two numbers following the exec-timeout command mean?

A.If no command has been typed in 35 seconds, the console connection will be closed.
B.If no router activity has been detected in 1 hour and 35 minutes, the console will be locked out.
C.If no commands have been typed in 1 minute and 35 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 35 seconds or the connection will be closed.

Answer: C

Correct answer: If no commands have been typed in 1 minute and 35 seconds, the console connection will be closed.

The two arguments to exec-timeout are minutes and then seconds, so exec-timeout 1 35 is one minute thirty-five. The line is console 0, so it governs the console rather than a Telnet session, and the effect is that the session is closed rather than locked. exec-timeout 0 0 disables the timeout altogether, which is convenient in a laboratory and unwise in production.

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What layer of the OSI model would you assume the problem is in 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.

Answer: 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.

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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

Answer: C

Correct answer: show interfaces

show interfaces reports every interface in turn with its configurable parameters and its running counters - status, encapsulation, addressing, load, errors and resets. The two configuration commands show what was configured rather than what is happening, and there is no show versions with an s.

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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

Answer: B

Correct answer: Router(config)#line vty 0 4

Two things must be right: the mode and the range. VTY lines are configured from global configuration mode, not from privileged exec and not from interface configuration mode, and the five default lines are numbered 0 to 4. There is no all keyword, and line console 0 configures a different line entirely.

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You need to find the broadcast address used on a LAN on your router. What command will you type into the router from user mode to find the broadcast address?

A.show running-config
B.show startup-config
C.show interfaces
D.show protocols

Answer: C

The command show ip protocols will actually show you the broadcast address for each interface - too bad it isn't a possible answer. Your best answer is show interfaces, which will provide the IP address and mask for each interface.

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Which command will delete the contents of NVRAM on a router?

A.delete NVRAM
B.delete startup-config
C.erase NVRAM
D.erase start

Answer: D

Correct answer: erase start

erase startup-config, abbreviated erase start, deletes the saved configuration held in NVRAM. There is no delete NVRAM or erase NVRAM command - the region is addressed through the file it holds. After the erase the running configuration is untouched, so nothing changes until the router is reloaded.

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10.

What keystroke will terminate setup mode?

A.Ctrl+Z
B.Ctrl+^
C.Ctrl+C
D.Ctrl+Shift+^

Answer: C

Correct answer: Ctrl+C

Ctrl+C aborts the setup dialogue and drops the router to the command line prompt with no configuration applied. Ctrl+Z ends configuration mode rather than setup, and Ctrl+Shift+6 is the break sequence used to interrupt a running command such as a long trace.

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