R1: G0/0 and S0/0/0
R2: G0/1 and S0/0/0
R1>enable
R1# show ip int brief
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 192.168.20.1 YES manual up up
GigabitEthernet0/1 192.168.30.1 YES manual administratively down down
Serial0/0/0 209.165.200.225 YES manual up up
Serial0/0/1 unassigned YES unset administratively down down
Vlan1 unassigned YES unset administratively down down
R2>enable
R2#show ip int brief
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 10.1.2.1 YES manual administratively down down
GigabitEthernet0/1 10.1.3.1 YES manual up up
Serial0/0/0 209.165.200.226 YES manual up up
Serial0/0/1 unassigned YES unset administratively down down
Vlan1 unassigned YES unset administratively down down