Which one of the following is the subnet mask equivalent of

Which one of the following is the subnet mask equivalent of /27?

A. 255.255.255.192

B. 255.255.255.224

C. 255.255.255.240

D. 255.255.255.248

Solution

B is correct. The 255.255.255.224 subnet mask is the equivalent of /27.

A, C, and D are incorrect. A is not correct because the 255.255.255.192 subnet mask is the equivalent of /26. C is not correct because the 255.255.255.240 subnet mask is the equivalent of /28. D is not correct because the 255.255.255.248 subnet mask is the equivalent of /29.