What is the correct formula for calculating the number of usable host IP addresses in a subnet?
A) 2x, X = host bits
B) 2x, X = network bits
C) 2x - 2, X = network bits
D) 2x - 2, X = host bits
D
Explanation: D) When you are calculating subnets, you use 2x - 2, where X = host bits. The two IP addresses that are subtracted include the network IP address (subnet network) and the subnet broadcast address.
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