With a prefix length of /20, what is the corresponding subnet mask?

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Multiple Choice

With a prefix length of /20, what is the corresponding subnet mask?

Explanation:
A /20 means the first 20 bits of the subnet mask are 1s. Writing that in binary across four octets gives: 11111111.11111111.11110000.00000000. Converting each octet to decimal yields 255.255.240.0. So the corresponding subnet mask is 255.255.240.0. (For reference, 255.255.0.0 is /16, 255.255.255.0 is /24, and 255.254.0.0 is /15.)

A /20 means the first 20 bits of the subnet mask are 1s. Writing that in binary across four octets gives: 11111111.11111111.11110000.00000000. Converting each octet to decimal yields 255.255.240.0. So the corresponding subnet mask is 255.255.240.0. (For reference, 255.255.0.0 is /16, 255.255.255.0 is /24, and 255.254.0.0 is /15.)

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