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Q:

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?

Serial 1 is down, line protocol is down

A) Physical layer B) Data Link layer
C) Network layer D) None
 
Answer & Explanation Answer: A) Physical layer

Explanation:

If you see that a serial interface and the protocol are both down, then you have a physical layer problem. If you see serial 1 is up, line protocol is down, then you are not receiving (Data Link) Keepalives from the remote end.

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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:

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
 
Answer & Explanation Answer: C) banner motd

Explanation:

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

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Q:

What switch must be added to the ipconfig command on a PC to verify DNS configuration?

A) /dns B) -dns
C) /all D) -all
 
Answer & Explanation Answer: C) /all

Explanation:

The /all switch must be added to the ipconfig command on a PC to verify DNS configuration.

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Q:

What network service is the most likely problem if you can ping a computer by IP address but not by name?

A) DNS B) DHCP
C) ARP D) ICMP
 
Answer & Explanation Answer: A) DNS

Explanation:

 The most likely problem if you can ping a computer by IP address but not by name is a failure of DNS.

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Q:

Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.25.224?

A) Router(config)#ip classless B) Router(config)#ip version 6
C) Router(config)#ip unnumbered D) Router(config)#ip subnet-zero
 
Answer & Explanation Answer: D) Router(config)#ip subnet-zero

Explanation:

A Class C subnet mask of 255.255.255.224 is 3 bits on and 5 bits off (11100000) and provides 8 subnets, each with 30 hosts. However, if the command ip subnet-zero is not used, then only 6 subnets would be available for use.

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Q:

If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?

A) 172.16.45.0 B) 172.16.45.4
C) 172.16.45.8 D) 172.16.45.12
 
Answer & Explanation Answer: D) 172.16.45.12

Explanation:

A/30, regardless of the class of address, has a 252 in the fourth octet. This means we have a block size of 4 and our subnets are o,4,8,12,16, etc. Address 14 is obviously in the 12 subnet.

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Q:

Differentiate the DoD and the OSI network models?

Answer

The DoD model is a condensed version of the OSI model, composed of four layers instead of seven, but is nonetheless like the OSI model in that it can be used to describe packet creation and devices and protocols can be mapped to its layers.

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