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单项选择题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

  • B

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