Which dotted-decimal subnet mask corresponds to a /26?

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Multiple Choice

Which dotted-decimal subnet mask corresponds to a /26?

Explanation:
A /26 has 26 ones in the subnet mask, so in dotted decimal it becomes 255.255.255.192. This works because the first three octets are fully on (255), and the last octet uses 11000000 in binary, which is 192 in decimal, giving two high bits set. That setup creates subnets of 64 addresses in the final octet (0–63, 64–127, 128–191, 192–255). The other masks correspond to different prefix lengths: 255.255.255.0 is /24, 255.255.255.224 is /27, and 255.255.255.255 is /32.

A /26 has 26 ones in the subnet mask, so in dotted decimal it becomes 255.255.255.192. This works because the first three octets are fully on (255), and the last octet uses 11000000 in binary, which is 192 in decimal, giving two high bits set. That setup creates subnets of 64 addresses in the final octet (0–63, 64–127, 128–191, 192–255). The other masks correspond to different prefix lengths: 255.255.255.0 is /24, 255.255.255.224 is /27, and 255.255.255.255 is /32.

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