An administrator is working with a network that uses the subnet mask 255.255.255.192. How many usable host IP addresses are available per subnet?
30
64
126
62
A subnet mask of 255.255.255.192 is equivalent to a /26 prefix in CIDR notation. An IPv4 address has 32 bits; with a /26 prefix, 26 bits are used for the network portion, leaving 6 bits for the host portion (32 - 26 = 6). The total number of addresses in the subnet is 2^6, which equals 64. In every subnet, two addresses are reserved and cannot be assigned to hosts: the network address (all host bits are 0) and the broadcast address (all host bits are 1). Therefore, the number of usable host addresses is 64 - 2 = 62.
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