单项选择题

An administrator has provided a 24 bit netmask. Which of the following options indicates the number of host addresses that are available in a network？（）

A.24
B.126
C.128
D.254

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单项选择题

A class B network 129.35 has 10 subnets. Which of the following options is the correct subnet mask？（）

A.255.255.128.0 （11111111.11111111.10000000.00000000）
B.255.255.192.0 （11111111.11111111.11000000.00000000）
C.255.255.224.0 （11111111.11111111.11100000.00000000）
D.255.255.240.0 （11111111.11111111.11110000.00000000）

单项选择题

A DNS server for a large network is experiencing performance problems. Which of the following options is the best solution to fix the problem？（）

A.Enable NIS
B.Purchase a larger server
C.Use /etc/hosts on all of the systems
D.Create secondary name servers throughout the network

单项选择题

An IP address is 198.37.16.23. Which of the following router’s IP addresses should be used to route traffic to the 193.130.56.0 network？（）

A.193.130.56.0
B.198.37.16.15
C.198.130.16.15
D.198.130.56.15