Which of the following are valid subnet IDs for network 172.16.0.0, assuming mask 255.255.224.0 is used throughout network 172.16.0.0?
A) 172.16.1.16
B) 172.16.0.0
C) 172.16.240.0
D) 172.16.160.0
E) 172.16.248.0
B, D
Explanation: B) The correct answers are 172.16.0.0 and 172.16.160.0 because, with the given mask of 255.255.224.0, subtracting the third value from 256 (256 - 224 ) equals 32 (magic number). The multiples of 32, starting with 0, include the values 32, 64, 128, 160, 192, and 224.
D) The correct answers are 172.16.0.0 and 172.16.160.0 because, with the given mask of 255.255.224.0, subtracting the third value from 256 (256 - 224 ) equals 32 (magic number). The multiples of 32, starting with 0, include the values 32, 64, 128, 160, 192, and 224.
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