Which CIDR notation corresponds to the subnet mask 255.255.240.0?

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Multiple Choice

Which CIDR notation corresponds to the subnet mask 255.255.240.0?

Explanation:
CIDR notation equals the number of leading 1 bits in the subnet mask. For 255.255.240.0, convert each octet to binary: 255 is 11111111, 255 is 11111111, 240 is 11110000, and 0 is 00000000. Counting the 1 bits from left to right gives 8 + 8 + 4 + 0 = 20. So the CIDR notation is /20. This matches the option that shows /20. To see why the others don’t fit: /8 would require 11111111.00000000.00000000.00000000, /16 would be 11111111.11111111.00000000.00000000, and /24 would be 11111111.11111111.11111111.00000000. The given mask has 4 ones in the third octet, producing 20 total.

CIDR notation equals the number of leading 1 bits in the subnet mask. For 255.255.240.0, convert each octet to binary: 255 is 11111111, 255 is 11111111, 240 is 11110000, and 0 is 00000000. Counting the 1 bits from left to right gives 8 + 8 + 4 + 0 = 20. So the CIDR notation is /20.

This matches the option that shows /20. To see why the others don’t fit: /8 would require 11111111.00000000.00000000.00000000, /16 would be 11111111.11111111.00000000.00000000, and /24 would be 11111111.11111111.11111111.00000000. The given mask has 4 ones in the third octet, producing 20 total.

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