In finding all possible subnet IDs for a network, what would be the magic number for subnetting network 172.16.0.0 using mask 255.255.240.0?
A) 16
B) 32
C) 240
D) 84
A
Explanation: A) The answer is derived from subtracting 240 (the first octet whose value is not 255 or 0 ) from 256.
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