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 Network+ practice questions - Default Network Mask

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Q1. Which of the following is Class C IP address?  

                A.      10.10.14.118

                B.      135.23.112.57

                C.      191.200.199.199

                D.      204.67.118.54

Correct Answer: D.

Explanation: 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)".

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