单项选择题

A.Enable ipforwarding onlyB.Configure an alias on the s……

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

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