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

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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
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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？（）

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C.Add a second interface into the same subnet and enable ipforwarding
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