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Objective 2.1
Plan a TCP/IP Network Infrastructure Strategy
15-11
C. Incorrect: The supplied address cannot provide users with Internet access
using
a NAT router because the address is registered and NAT requires unregistered
addresses. Therefore, it is not true that the address satisfies the
secondary goal.
The address does satisfy the primary goal, however, because the host
identifier is
large enough to support up to 126 hosts.
D. Incorrect: Although the supplied address does not satisfy the secondary
goal
because the address is registered, it does satisfy the primary goal.
4.
Correct Answers: A and D
A. Correct: This answer is correct because it is a Class A address with 14
network
identifier bits. Class A addresses have 8 network identifier bits, which
leaves 6 bits
for the subnet identifier and 18 bits for the host identifier. The 6 bits
are sufficient
to support 60 subnets, and each subnet can have up to 26,142 hosts.
B. Incorrect: This answer is incorrect because this is an unsubnetted Class
C
address, which supports only one subnet with up to 254 hosts.
C. Incorrect: This answer is incorrect because, although a Class B address
with 25
network identifier bits leaves 9 bits for the subnet identifier, which
easily supports
60 subnets, only 7 bits are left for the host identifier. With only 7 bits
for the host
identifier, you can only have up to 126 hosts on each subnet.
D. Correct: This answer is correct because a Class A address with 21 network
iden-
tifier bits leaves 13 bits for the subnet identifier, which supports over
8,000 subnets
and over 2,000 hosts per subnet.
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