An administrator issues the show ip interface s0/0 command and the output displays that interface Serial0/0 is up, line protocol is up. What does “line protocol is up” specifically indicate about the interface?

Question:
An administrator issues the show ip interface s0/0 command and the output displays that interface Serial0/0 is up, line protocol is up. What does “line protocol is up” specifically indicate about the interface?

• The cable is attached properly.
• CDP has discovered the connected device.
• Keepalives are being received on the interface.
• A carrier detect signal has been received from the connected device.
• IP is correctly configured on the interface.

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