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

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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

单项选择题

A host is expected to be a mail relay or receiving endpoint. Which of the following daemons should be listening for connections on port 25？（）

A.ftpd
B.imapd
C.pop3d
D.sendmail

单项选择题

A machine’s ONLY external interface is configured with an address of 192.168.5.1 and a netmask of 255.255.255.0. No slots are available for expansion. Which of the following procedures should be performed to make it function as a gateway？（）

A.Enable ipforwarding only
B.Configure an alias on the same interface and enable ipforwarding
C.Add a second interface into the same subnet and enable ipforwarding
D.Add a second interface into a different subnet， and enable ipforwarding