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What is the subnetwork number of a host with an IP...

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What is the subnetwork number of a host with an IP address of 172.16.66.0/21?

Answer & Solution
Correct Answer: Option C
A /21 is 255.255.248.0, which means we have a block size of 8 in the third octet, so we just count by 8 until we reach 66. The subnet in this question is 64.0. The next subnet is 72.0, so the broadcast address of the 64 subnet is 71.255.
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