A technician testing the functionality of a recently installed router is unable to ping the serial interface of a remote router. The technician executes the show interfaces serial 0/0/0 command on the local router and sees the following line in the router: Serial0/0/0 is down, line protocol is down What are two possible causes of this command output?

A technician testing the functionality of a recently installed router is unable to ping the serial interface of a remote router. The technician executes the show interfaces serial 0/0/0 command on the local router and sees the following line in the router:

Serial0/0/0 is down, line protocol is down

What are two possible causes of this command output?

• The clock rate command is missing.
• The carrier detect signal is not sensed.
• Keepalives are not being sent.
• The interface is disabled due to a high error rate.
• The interface is shut down.
• The 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: EWAN v4 Chapter 2 Check Your Understanding: PPP