Amachine’sONLYexternalinterfaceisconfiguredwithanaddressof192.168.5.1andanetmaskof255.255.255.0.Noslotsareavailableforexpansion.Whichofthefollowingproceduresshouldbeperformedtomakeitfunctionasagateway？（）
A.Enableipforwardingonly
B.Configureanaliasonthesameinterfaceandenableipforwarding
C.Addasecondinterfaceintothesamesubnetandenableipforwarding
D.Addasecondinterfaceintoadifferentsubnet，andenableipforwarding
参考答案：B
