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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 = 125.134.112.66 Mask = 255.255.224.0 What is the first address (Network address)?

In a class B subnet, we know the IP address of one host and the mask as given below: IP address = 125.134.112.66 Mask = 255.255.224.0 What is the first address (Network address)? Correct Answer 125.134.96.0

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

 01000010

Subnet Mask

255.255.224.0

11111111

11111111

11100000

 00000000

Network  Address 

125.134.96.0

 01111101

 10000110

 01100000

 00000000

Hence, IP Address 125.134.96.0 is the First address.

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