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?
IT Exam Items Repository › Category: CCNA 4 v4.0 EWAN › 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).
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