Which of the following is a correct dotted-decimal mask for a /20?

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Multiple Choice

Which of the following is a correct dotted-decimal mask for a /20?

Explanation:
A /20 means the mask has 20 bits set to 1. When you convert that to dotted decimal, you fill the first two octets with 255 (all ones), and in the third octet you have 11110000, which is 240, while the last octet is 0. So the correct dotted-decimal mask is 255.255.240.0. Among the options, none match that exact pattern; the one that looks related is 255.255.255.240, which actually corresponds to a /28, not /20. The other masks correspond to /24, /16, and /8, which are different prefix lengths.

A /20 means the mask has 20 bits set to 1. When you convert that to dotted decimal, you fill the first two octets with 255 (all ones), and in the third octet you have 11110000, which is 240, while the last octet is 0. So the correct dotted-decimal mask is 255.255.240.0. Among the options, none match that exact pattern; the one that looks related is 255.255.255.240, which actually corresponds to a /28, not /20. The other masks correspond to /24, /16, and /8, which are different prefix lengths.

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