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Classes of Networks


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Q1. Which of the following is a Class B network?

  Correct Answer: C



IP addresses are written using decimal numbers separated by decimal points. This is called dotted decimal notation of expressing IP addresses.
The different classes of IP addresses is as below:

Class Format Leading Bits Network address Range Max.# of networks 

A N.H.H.H 0 0 - 126 127 
B N.N.H.H 10 128 - 191 16,384 
C N.N.N.H 110 192 - 223 2,097,152 

Network address of all zeros means "This network or segment".
Network address of all 1s means " all networks", same as hexadecimal of all Fs.
Network number 127 is reserved for loopback tests.
Host(Node) address of all zeros mean "This Host (Node)".
Host (Node) address of all 1s mean "all Hosts (Nodes) " on the specified network.

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