199+ CCNA Questions and Answers with Explanation For Exams, Interview

Q:

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 & Explanation Answer: B) Router (config) #line vty 0 4

Explanation:

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

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Q:

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

Answer & Explanation Answer: B) There is more than one show command that starts with the letters ru.

Explanation:

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.

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Q:

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

Answer & Explanation Answer: C) Setup mode

Explanation:

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.

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Q:

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?

A) You must type the show ip rip command first	B) IP addressing on the network is incorrect
C) You must use the terminal monitor command	D) Debug output is sent only to the console.

Answer & Explanation Answer: C) You must use the terminal monitor command

Explanation:

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

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Q:

The network address used to advertise a summary address is always which of the following?

A) The last network address in the block	B) The next to last network in the block
C) The second network in the block	D) The first network in the block

Answer & Explanation Answer: D) The first network in the block

Explanation:

The network address used to advertise a summary address is always the first network in the block

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Q:

Your inside locals are not being translated to the inside global addresses. Which of the following commands will show you if your inside globals are allowed to use the NAT pool?

ip nat pool Corp 198.18.41.129 198.18.41.134 netmask 255.255.255.248

ip nat inside source list 100 int pool Corp overload

A) debug ip nat	B) show access - list
C) show ip nat translation	D) show ip nat statistics

Answer & Explanation Answer: B) show access - list

Explanation:

Once you create your pool, the command ip nat inside source must be used to say which inside locals are allowed to use the pool. In this question we need to see if access - list 100 is configured correctly, if at all , so show access - list is the best answer.

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Q:

Which command displays IP-to-MAC- address mappings on a Windows PC?

A) ping	B) traceroute
C) arp -a	D) tracert

Answer & Explanation Answer: C) arp -a

Explanation:

The arp -a command displays IP-to-MAC-address mappings on a Windows PC.

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Q:

What is frame tagging?

Answer

Frame identification (frame tagging) uniquely assigns a user-defined ID to each frame. This is sometimes reffered to as a VLAN ID or color.

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