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？（）

单项选择题Amachine’sONLYexternalinterfaceisconfiguredwithanaddressof192.168.5.1andanetmaskof255.255.255.0.Noslotsareavailableforexpansion.Whichofthefollowingproceduresshouldbeperformedtomakeitfunctionasagateway？（）

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Allofthefollowingcommandscanbeusedtoplaceaninterfaceintothe down stateEXCEPT：（）。

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

单项选择题Whichcommandwillchangethequantityofbioddaemonsimmediatelyandforeachsubsequentreboot？（）

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

单项选择题WhichDHCPallocationmethodallowsautomaticreuseofanaddressthatisnolongerneededbythelienttowhichitwasassigned？（）

A.Automatic
B.Dynamic
C.Reuse
D.Manual

单项选择题AsystemadministratorhaseditedthenecessaryfilesforsetupofanAIXsystemtoserveasabootpserver.Whichofthefollowingcommandsisrequiredtocompletetheactivation？（）

A.telinit -q
B.startsrc -s bootpd
C.refresh -s inetd