Question 520
At Dunhaven University, the campus systems team is preparing a multi-building classroom network upgrade. The operational constraint is classroom Wi-Fi and VoIP availability. The owner reports that the correction is complete for this issue: An interface displays operationally down while its administrative setting is up, and counters show no carrier. Which result BEST demonstrates that this specific issue was resolved?
Explanation
Correct Answer
The recovered link shows operational-up state and receive/transmit counters increase during test traffic. This is the relevant acceptance observation for the reported issue: An interface displays operationally down while its administrative setting is up, and counters show no carrier. The intended corrective choice is: Inspect physical-layer, optic and peer state rather than treating it as an administrative shutdown. At Dunhaven University, this outcome verifies actual operation under classroom Wi-Fi and VoIP availability, rather than only a ticket marked complete.
Incorrect Answers
Power demand fits supported supply and PoE denial counts stop during full load. Such an observation would verify a separate issue: PoE output reports repeated deny events although interface link counters look normal. It would follow the distinct action: Interpret PoE allocation, supply and per-port power class telemetry independently from link state. Here the reported failure is An interface displays operationally down while its administrative setting is up, and counters show no carrier. The decisive result for Dunhaven University must instead be: The recovered link shows operational-up state and receive/transmit counters increase during test traffic.
The peer reaches Established and route exchange follows intended filters. Such an observation would verify a separate issue: A BGP session moves between Idle and Active and receives no routes. It would follow the distinct action: Inspect transport reachability, peer IP, ASNs, TCP/179 policy and authentication conditions. Here the reported failure is An interface displays operationally down while its administrative setting is up, and counters show no carrier. The decisive result for Dunhaven University must instead be: The recovered link shows operational-up state and receive/transmit counters increase during test traffic.
A root cause is documented from timestamped route and interface events despite high device uptime. Such an observation would verify a separate issue: A core switch has been continuously up for months but its route-flap alarms spiked overnight. It would follow the distinct action: Review operational stability across routing, interfaces and change logs rather than using uptime as proof of health. Here the reported failure is An interface displays operationally down while its administrative setting is up, and counters show no carrier. The decisive result for Dunhaven University must instead be: The recovered link shows operational-up state and receive/transmit counters increase during test traffic.