What is the subnet number of a host with an IP address of 172.16.66.0/21?
A) 172.16.36.0
B) 172.16.48.0
C) 172.16.64.0
D) 172.16.0.0
C
Explanation: C) The /21, or 255.255.248.0, mask provides 5 subnet bits (25 = 32), which would make the subnet numbers multiples of 32 starting at 172.16.0.0, 172.16.32.0, 172.16.64.0, and so on, with the address 172.16.66.0/21 being part of the 172.16.64.0 network.
Computer Science & Information Technology
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