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