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Q:

What is the subnetwork address for a host with the IP address 200.10.5.68/28?

A) 200.10.5.56 B) 200.10.5.32
C) 200.10.5.64 D) 200.10.5.0
 
Answer & Explanation Answer: C) 200.10.5.64

Explanation:

This is a pretty simple question. A/28 is 255.255.255.240, which means that our block size is 16 in the fourth octent. 0,16, 32, 48, 64, 80, etc. The host is in the 64 subnet.

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Q:

Which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?

A) /28 B) /29
C) /30 D) /31
 
Answer & Explanation Answer: C) /30

Explanation:

A point-to-point link uses only two hosts. A/30, or 255.255.255.252, mask provides two hosts per subnet.

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Q:

The network address of 172.16.0.0/19 provides how many subnets and hosts?

A) 7 subnets, 2046 hosts each B) 7 subnets, 8190 hosts each
C) 8 subnets, 2046 hosts each D) 8 subnets, 8190 hosts each
 
Answer & Explanation Answer: D) 8 subnets, 8190 hosts each

Explanation:

A CIDR address of/19 is 255.255.224.0. This is a Class B address, so that is only 3 subnet bits, but it provides 13 host bits, or 8 subnets, each with 8,190 hosts.

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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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Q:

What is the Class C private IP address space?

Answer

192.168.0.0 through 192.168.255.255

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Q:

What is the Class B private IP address space?

Answer

172.16.0.0 through 172.31.255.255

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Q:

What is the Classs A Private IP address space?

Answer

10.0.0.0 through 10.255.255.255

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