Question

 How many valid host addresses are available on an IPv4 subnet that is configured with a /25 mask?

a. 254

b. 126

c. 62

d. 30 

Answer 1

When a /25 mask is used, 6 bits are used as host bits. With 6 bits, 64 addresses are possible, but one address is for the subnet number and one address is for a broadcast. This leaves 62 addresses that can be assigned to network devices.

Answer=C