Question Bank - Computer Networks

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In a class B subnet, we know the IP address of one host and the mask as given below:IP address = 125.134.112.66Mask = 255.255.224.0What is the first address (Network address)?

A.
125.134.96.0
B.
125.134.112.0
C.
125.134.112.66
D.
125.134.0.0

Solution:

The correct answer is "option 1".CONCEPT:Network address or First address is used for network identification.The Network address is calculated by Bitwise AND operation of corresponding binary bits of IP Address & Subnet mask.CALCULATION:IP Address 125.134.112.66 01111101 10000110 01110000 01000010Subnet Mask255.255.224.0111111111111111111100000 00000000Network Address 125.134.96.0 01111101 10000110 01100000 00000000Hence, IP Address 125.134.96.0 is the First address.

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