Discussion
What is the subnetwork address for a host with the IP address 200.10.5.68/28?
Answer: C
Correct answer: 200.10.5.64
A /28 gives blocks of sixteen, so the boundaries are 0, 16, 32, 48, 64, 80 and so on. The address .68 falls in the block beginning at 64, which is therefore the subnet address; the broadcast is .79 and the usable range .65 to .78. The 56 offered is not a multiple of sixteen and could not be a /28 boundary at all.
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