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    R2(config)#interface gigabitEthernet 0/0

    R2(config-GigabitEthernet 0/0)#ip address 192.168.1.2 255.255.255.0

    R2(config-GigabitEthernet 0/0)#exit

    R2(config)#interface gigabitEthernet 0/1

    R2(config-GigabitEthernet 0/1)#ip address 172.16.1.1 255.255.255.0

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