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Chapter 3
Internet Protocols
23.
D. Easy question, easy answer. The third octet is used for all subnets,
and the fourth octet is used only for hosts. 8 bits for subnetting, 8 bits
for hosts.
24.
B. This one takes some thought. 255.255.255.0 would give you
254 hosts each with 254 subnets. Doesn't work for this question.
255.255.254.0 would provide 126 subnets, each with 510 hosts; the
second option looks good. 255.255.252.0 is 62 subnets, each with
1022 hosts. So 255.255.254.0 is the only correct answer.
25.
C. 127.0.0.1 is called the loopback address and is used for diagnos-
tics on a host. If you cannot ping this address, then you have a problem
with the IP stack on the host.
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