How many subnets do you get with a subnet of 192.168.1.0/28?
A) 12
B) 13
C) 16
D) 20
C
Explanation: The binary representation of /28 prefix is 11111111.11111111.11111111.11110000. The formula to determine the number of subnets is 2 ^ X, where X is equal to the number of borrowed bits (above and beyond the default mask of 24, for this Class C address). In this case, there are 4 borrowed bits ( 2 ^ 4 = 16); therefore, there are 16 possible subnets.
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