A network administrator receives the output “Serial0 is up, line protocol is down” from the show interface s0 command. At what layer is this problem most likely being caused?
- Physical layer
- Data link layer
- Network layer
- Transport layer
Explanation: The first part, “Serial0 is up,” indicates that the physical layer is operational. The second part, “line protocol is down,” indicates a Layer 2 problem.
Exam with this question: EWAN v4 Chapter 8 Check Your Understanding: Network Troubleshooting
Exam with this question: CCNA 4 Exploration v4.0 Chapter 8 Quiz
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