ISRO | ISRO CS 2013 | Question 42
What is IP class and number of sub-networks if the subnet mask is 255.224.0.0?
(A) Class A, 3
(B) Class A, 8
(C) Class B, 3
(D) Class B, 32
Explanation: Subnet mask = 11111111.11100000.00000000.00000000
The first 8 bits represent Class A network address
And next 3 ones used for subnet. Number of subnets = 2^3=8.
(B) is the correct answer.
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