| Exam 200-301 | Question id=5558 | Network Fundamentals |
Which Cisco IOS command would produce the following output?
Serial0/0/0 is administratively down, line protocol is down
Hardware is GT96K Serial
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 HDLC. loopback not set.
Keepalive set (10 sec)
Last input never, output 0:00:14, output hang never
Last clearing of "show interface" counters 0:00:00
Input queue 0/40/0/0, (size/max/drops/flushes);Total output drops : 81071
Qeueing strategy:FIFO
Output Queue: 0/40 (size/max)
Five minute input rate 0 bits sec, 0 packets sec
Five minute output rate 0 bits sec, 0 packets sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
145 packets output, 5084 bytes, 0 underruns
0 output errors, 0 collisions, 4 interface resets, 0 restarts
<Output omitted>
| A. |
show ip interface | |
| B. |
show ip interface brief | |
| C. |
show interfaces | |
| D. |
show interface brief |
The output given in the question is produced with the show interfaces command. This command is used to view the statistics for the configured interfaces on the router. From the sample output, we can determine the following facts:
The interface has not been enabled, as indicated by the first line Serial0/0/0 is administratively down. It is not ready to for to forward packets. To enable it, the no shutdown command should be entered.
* Line 3 shows that the subnet mask is 255.255.255.0.
* Line 3 shows that the IP address is 134.108.28.8, a public IP address.
* Line 6 shows that the encapsulation is HDLC, which is the default.
* The interface is NOT connected to a LAN, because it is a serial interface.
Two fields worth mentioning in the output of the show interfaces command are the no buffer and the ignored fields. The ignored field shows the number of received packets ignored by the interface because the interface hardware ran low on internal buffers. The no buffer field shows the number of received packets discarded because there was no buffer space in the main system. When either of these two counters begins to increment, it could be the result of a broadcast storm.
Since the show interfaces command displays the up/down state of the interfaces, it is a good command for troubleshooting. For example, any time users cannot access a resource that requires them to traverse a router, it is always a good idea to use show interfaces to take a quick look at the state of the interfaces.