CCNA Cisco Certified Network Associate (#71)

Section: Version 2.0

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.