If you subnet a class B IP address to 255.255.255.0,how many bits are left for hosts,and how many host IDs does that equal per subnet?
A)8,256
B)8,255
C)7,254
D)8,254

Question

Quizplus · Accepted Answer

Subnetting a class B IP address with a subnet mask of 255.255.255.0 leaves 8 bits for host addresses (16 bits for network addresses). The formula to calculate the number of host IDs per subnet is 2^n - 2 (where n is the number of bits for host addresses), because the first and last addresses are reserved for network address and broadcast address respectively. Thus, 2^8 - 2 = 254 host IDs per subnet. Therefore, the correct choice is option D.

If You Subnet a Class B IP Address to 255