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Subnetting - Technical MCQs

Q1:

You have a network with a subnet of 172.16.17.0/22. Which is the valid host address?

A 172.16.17.1 255.255.255.252

B 172.16.0.1 255.255.240.0

C 172.16.20.1 255.255.254.0

D 172.16.18.255 255.255.252.0

ANS:D - 172.16.18.255 255.255.252.0

A Class B network ID with a /22 mask is 255.255.252.0, with a block size of 4 in the third octet. The network address in the question is in subnet 172.16.16.0 with a broadcast address of 172.16.19.255. Only option E even has the correct subnet mask listed, and 172.16.18.255 is a valid host.