Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable? (Choose three.)
A.
10.15.32.17
B.
17.15.66.128
C.
66.55.128.1
D.
135.1.64.34
E.
129.33.192.192
F.
192.168.5.63
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First we need to find out the forms of network addresses and broadcast addresses when the subnet mask of /27 is used:
Increment: 32
Network address: In the form of x.x.x.(0,32,64,96,128,160,192,224)
Broadcast address: In the form of x.x.x.(31,63,95,127,159,191,223)
So we only need to check the fourth octets of the IP addresses above. If they are not in the form of network addresses or broadcast addresses then they can be assigned to hosts.
Notice that the IP 66.55.128.1 belongs to the subnet zero and the question says subnet zero is usable so it is valid.
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