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

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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

单项选择题

All of the following commands can be used to place an interface into the "down" state EXCEPT：（）。

A.arp
B.smit
C.chdev
D.ifconfig

单项选择题

Which command will change the quantity of biod daemons immediately and for each subsequent reboot？（）

A.chnfs -b newvalue
B.chnfs -N -b newvalue
C.chnfs -I -b newvalue
D.netstat -s newvalue