單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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