单项选择题

A.Enable NISB.Purchase a larger serverC.Use etc hosts o……

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AnIPaddressis198.37.16.23.Whichofthefollowingrouter’sIPaddressesshouldbeusedtoroutetraffictothe193.130.56.0network？（）

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Ahostisexpectedtobeamailrelayorreceivingendpoint.Whichofthefollowingdaemonsshouldbelisteningforconnectionsonport25？（）

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

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