Which of the following are valid subnet IDs for network 172.168.0.0, assuming mask 255.255.252.0 is used throughout network 172.168.0.0?

A) 172.168.2.0
B) 172.168.4.0
C) 172.168.42.0
D) 172.168.108.0
E) 172.168.110.0

B, D
Explanation: B) The correct answers are 172.168.4.0 and 172.168.108.0 because, with the given mask of 255.255.252.0, subtracting the third value from 256 (256 - 252 ) equals 4 (magic number). When you list the multiples of 4, you will find 4 and 108 are the only available options.
D) The correct answers are 172.168.4.0 and 172.168.108.0 because, with the given mask of 255.255.252.0, subtracting the third value from 256 (256 - 252 ) equals 4 (magic number). When you list the multiples of 4, you will find 4 and 108 are the only available options.

Computer Science & Information Technology

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