Description: By default, an interface will be in shut-down state. We need to issue no shutdown command to bring-up the interface. Notice that the show interfaces command shows that the line protocol is up indicating that the interface is now active (sending and receiving packets).
Instructions:
1. View the information about interface serial 0
2. Bring serial 0 to no shutdown state
3. Now view the state of the interface serial 0
R1>enable
R1#show interfaces serial 0
R1#configure terminal
R1(config)#interface serial 0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#exit
R1#show interfaces serial 0
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