subnetting problem.

durairaj29

Hi

I had through this question from one of the sites, as for me concern the answer is (2 raised to the 16 power) but the sites choosen the ans of (2 raised to the 14 power), can anyone clear my doubt in this.
How many unique class B network address are there?

2 raised to the 16 power
2 raised to the 14 power
2 raised to the 14 power minus 2
2 raised to the 16 power minus 2

elementour

there are 16,384 class b networks with 65,534 addresses per network. the power of 14 gives the useable networks as it doesnt count all zeros or all 1's

dtlokee

2**14 would be correct, 2**14 = 16,384

NeonNoodle

A Class B address has 16 network bits and 16 host bits. However, the first two bits of a Class B network must be 10 (binary) -- which gives it its range of 128.0.0.0 -- 191.255.255.255. Therefore, since the first two bits are fixed, there are only 16-2=14 bits that can vary. Thus, there are only 2^14 network addresses.