An organization with a class B network address has 100 subnets.Each subnet in this organization can have at most _____ bits for the host ID.
A)8
B)9
C)7
D)6

Question

Quizplus · Accepted Answer

For a class B network address, there are 16 bits reserved for the network ID and 16 bits reserved for the host ID. 
To create 100 subnets, we need to borrow bits from the host ID portion and use them as subnet ID bits. 
The formula for calculating the number of bits required for the subnet ID is:
2^n ≥ number of subnets
where n is the number of bits borrowed. 
In this case, we need to find the smallest value of n that satisfies the above inequality:
2^n ≥ 100
n = 7
Therefore, we need to borrow 7 bits from the host ID to create 100 subnets. The remaining 9 bits can be used for the host ID. Hence, the answer is B.

An Organization with a Class B Network Address Has 100