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Subnetting

Q1: If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?

A 172.16.45.0

B 172.16.45.4

C 172.16.45.8

D 172.16.45.12

ANS:D - 172.16.45.12

A /30, regardless of the class of address, has a 252 in the fourth octet. This means we have a block size of 4 and our subnets are 0, 4, 8, 12, 16, etc. Address 14 is obviously in the 12 subnet.



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