Given a Class C IP address subnetted with a /30 subnet mask, how many valid host IP addresses
are available on each of the subnets?
A.
1
B.
2
C.
4
D.
8
E.
252
F.
254
Explanation:
/30 CIDR corresponds to mask 55.255.255.252 whose binary is 11111100 which means 6 subnet
bits and 2 host bits which means 62 subnets and 2 hosts per subnet.
B
Using a subnet mask of /30 leaves 2 usable host addresses per subnet. (4 in total, but we have to retract 2 for the network and broadcast addresses)