| Exam 200-301 | Question id=5544 | Network Fundamentals |
The following is a partial output of the show interfaces command:
Serial 0 is up. line protocol is down
Hardware is MCI Ethernet, address is 0000.0c00.750c (bia 0000.0c00.750c)
Internet address is 134.108.28.8, subnet mask is 255.255.255.0
MTU 1500 bytes. BW 10000 Kbit, DLY 100000 usee, rely 255 255, load 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 4:00:00
Last input 0:00:00, output 0:00:00, output hang never
Last clearing of "show interface" counters 0:00:00
Output queue 0/40, 0 drops: input queue 0/75, 0 drops
Five minute input rate 0 bits/sec, 0 packets, sec
Five minute output rate 2000 bits sec, 4 packets sec
1127576 packets input, 447251251 bytes, 0 no buffer
Received 354125 broadcasts, 0 runts, 0 giants, 57186* throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
5332142 packets output, 496316039 bytes, 0 underruns
0 output errors, 432 collisions, 0 interface resets, 0 restarts
<Output omitted>
What does the Serial 0 is up, line protocol is down statement signify in the output?
| A. |
the shutdown interface command is present in the router configuration | |
| B. |
a cable is unplugged | |
| C. |
the interface is displaying normal operation | |
| D. |
there are no problems with physical connectivity | |
| E. |
there is a configuration problem in the local or remote router |
The Serial 0 is up, line protocol is down statement in the output signifies the following:
* There are no problems with the physical connectivity.
* There is a configuration problem in the local or remote router.
* The remote router might not be sending the keep-alives.
* There may be a problem with the leased lines such as line noise and a malfunctioning switch.
* There is an incorrect configuration of the CSU/DSU, which can cause timing issues on the cable.
* The local or remote CSU/DSU might have failed.
The option stating that the shutdown interface command is present in the router configuration is incorrect because if the shutdown interface command is present in the router configuration, the message displayed would be Serial 0 is administratively down, line protocol is down.
The option stating that a cable is unplugged is incorrect because that would be indicated by Serial 0 is down, line protocol is down. Physical problems such as a bad cable or cable unplugged are addressed in the first part of the output (serial0 is up/down).
The option stating that the message refers to normal operation of the interface is incorrect because the line protocol is shown as down, which indicates a problem.