How many Class C networks are available in classful IPv4 addressing?

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Multiple Choice

How many Class C networks are available in classful IPv4 addressing?

Explanation:
In Classful IPv4 addressing, networks are defined by the class and by the bits that can vary within the network portion. For Class C, the network portion is the first three octets, and the first three bits of the first octet are fixed to 110. That leaves 5 bits in the first octet plus all 8 bits of the next two octets to vary, giving 2^(5+8+8) networks = 2^21 = 2,097,152 networks. Each of these networks has 256 addresses (0–255), with two addresses typically reserved (network and broadcast).

In Classful IPv4 addressing, networks are defined by the class and by the bits that can vary within the network portion. For Class C, the network portion is the first three octets, and the first three bits of the first octet are fixed to 110. That leaves 5 bits in the first octet plus all 8 bits of the next two octets to vary, giving 2^(5+8+8) networks = 2^21 = 2,097,152 networks. Each of these networks has 256 addresses (0–255), with two addresses typically reserved (network and broadcast).

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