A technician testing functionality of a recently installed router is unable to ping the serial interface of a remote router. The technician executes the show interface serial0/0 command on the local router and sees the following line in the router:
Serial0/0 is down, line protocol is down
What are two possible causes for this command output? (Choose two.)
- clockrate command missing
- carrier detect signal not sensed
- keepalives not being sent
- interface disabled due to high error rate
- interface shutdown
- cabling is faulty or incorrect
Explanation: This state can be caused by the router’s not sensing a CD signal, which means that the CD is not active. This state can also be caused by faulty or incorrect cabling. Other causes include a WAN carrier service provider problem, which means that the line is down or is not connected to the CSU/DSU, or a hardware failure (CSU/DSU).
Exam with this question: CCNA 4 Exploration v4.0 Chapter 2 Quiz
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