200-301 · Question #1169
200-301 Question #1169: Real Exam Question with Answer & Explanation
The correct answer is C: physical errors. The interface output shows a reliability score of 250/255, indicating frequent physical errors or instability on the link, which is the root cause of the reported network slowness.
Question
A technician receives a report of network slowness and the issue has been isolated to the interface FastEthemet0/13. What is the root cause of the issue? FastEthernet0/13 is up, line protocol is up Hardware is Fast Ethernet, address is 0001.4d27.66cd (bia 0001.4d27.66cd) MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 250/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex (Full) Auto Speed (100), 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input 18:52:43, output 00:00:01, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 12000 bits/sec, 6 packets/sec 5 minute output rate 24000 bits/sec, 6 packets/sec 14488019 packets input, 2434163609 bytes Received 345348 broadcasts, 0 runts, 0 giants, 0 throttles 261028 input errors, 259429 CRC, 1599 frame, 0 overrun, 0 ignored 0 watchdog, 84207 multicast 0 input packets with dribble condition detected 19658279 packets output, 3529106068 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out
Options
- Alocal buffer overload
- Berr-disabled port on the far end
- Cphysical errors
- Dduplicate IP addressing
Explanation
The interface output shows a reliability score of 250/255, indicating frequent physical errors or instability on the link, which is the root cause of the reported network slowness.
Common mistakes.
- A. The output shows "Output queue 0/40, 0 drops; input queue 0/75, 0 drops," which means there are no packets being dropped due to buffer overload on this interface.
- B. The interface status is "FastEthernet0/13 is up, line protocol is up," indicating the port is active and operational, not in an err-disabled state on either end.
- D. Duplicate IP addressing typically manifests as intermittent connectivity issues or ARP conflicts, but it would not directly result in a low reliability score on a physical interface.
Concept tested. Interpreting 'show interface' output for troubleshooting
Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet-interface/10565-3.html
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