Which CIDR notation corresponds to 255.255.255.0?

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Multiple Choice

Which CIDR notation corresponds to 255.255.255.0?

Explanation:
CIDR notation counts how many high-order bits are used for the network. The subnet mask 255.255.255.0 in binary is 11111111.11111111.11111111.00000000, which has 24 ones. That means the network portion is 24 bits, so the correct CIDR is /24. A /24 subnet yields 256 addresses in that block (2^(32−24) = 256). For reference, a /4 would be 240.0.0.0, a /8 would be 255.0.0.0, and a /30 would be 255.255.255.252.

CIDR notation counts how many high-order bits are used for the network. The subnet mask 255.255.255.0 in binary is 11111111.11111111.11111111.00000000, which has 24 ones. That means the network portion is 24 bits, so the correct CIDR is /24. A /24 subnet yields 256 addresses in that block (2^(32−24) = 256). For reference, a /4 would be 240.0.0.0, a /8 would be 255.0.0.0, and a /30 would be 255.255.255.252.

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