单选题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？（）AEnable ipforwarding onlyBConfigure an alias on the same interface and enable ipforwardingCAdd a second interface into the same subnet and enable ipforwardingDAdd a second interface into a different subnet， and enable ipforwarding
单选题
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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