IOS and Security Device Manager Questions and Answers

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: What command do you type to save the configuration stored in RAM to NVRAM?

Correct answer: Router#copy run startupcopy running-config startup-config, abbreviated copy run start, writes the running configuration in RAM to NVRAM. It is a privileged exec command, not a configuration command, which is what rules out the two options shown at a (config)# prompt - and the direction matters, since copy start run merges the saved configuration back into the running one.

Q: How many simultaneous Telnet sessions does a Cisco router support by default?

Correct answer: 5A router provides five VTY lines by default, numbered 0 to 4, so five users may be connected simultaneously by Telnet or SSH. That is why line vty 0 4 is the command that configures them all, and it is also why a sixth attempt is refused until a line is freed - sessions left open can be cleared with clear line.

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: 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: 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.

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: Which command will show you whether a DTE or a DCE cable is plugged into serial 0?

Correct answer: show controllers serial 0show controllers reports at the physical layer, below the interface, and its output states whether a DTE or a DCE cable is attached - and if DCE, what clock rate is set. That matters on a back-to-back laboratory link, where the DCE end must supply the clock or the line protocol will never come up. show interface reports the line and protocol status but not the cable type.

11.

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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12.

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 startup

Answer: D

Correct answer: Router#copy run startup

copy running-config startup-config, abbreviated copy run start, writes the running configuration in RAM to NVRAM. It is a privileged exec command, not a configuration command, which is what rules out the two options shown at a (config)# prompt - and the direction matters, since copy start run merges the saved configuration back into the running one.

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13.

How many simultaneous Telnet sessions does a Cisco router support by default?

Answer: D

Correct answer: 5

A router provides five VTY lines by default, numbered 0 to 4, so five users may be connected simultaneously by Telnet or SSH. That is why line vty 0 4 is the command that configures them all, and it is also why a sixth attempt is refused until a line is freed - sessions left open can be cleared with clear line.

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14.

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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15.

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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16.

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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17.

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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18.

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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19.

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 serial 0
D.show serial 0 controllers

Answer: C

Correct answer: show controllers serial 0

show controllers reports at the physical layer, below the interface, and its output states whether a DTE or a DCE cable is attached - and if DCE, what clock rate is set. That matters on a back-to-back laboratory link, where the DCE end must supply the clock or the line protocol will never come up. show interface reports the line and protocol status but not the cable type.

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