单项选择题
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
单项选择题 AnIPaddressis198.37.16.23.Whichofthefollowingrouter’sIPaddressesshouldbeusedtoroutetraffictothe193.130.56.0network？（）
单项选择题 Ahostisexpectedtobeamailrelayorreceivingendpoint.Whichofthefollowingdaemonsshouldbelisteningforconnectionsonport25？（）
单项选择题 Amachine’sONLYexternalinterfaceisconfiguredwithanaddressof192.168.5.1andanetmaskof255.255.255.0.Noslotsareavailableforexpansion.Whichofthefollowingproceduresshouldbeperformedtomakeitfunctionasagateway？（）