Question 990
A wireless voice call has low RSSI but the WLAN team tries to repair it solely with DSCP priority rules. Which first diagnostic check is most useful before changing the network?
Explanation
Correct Answer
This check collects evidence at the layer implicated by the symptom: traffic priority cannot compensate for unusable wireless link quality. Examine the evidence before choosing the corrective change.
Incorrect Answers
This would be a reasonable check when a high-density WLAN has a large number of associated idle devices; an operator assumes association count alone proves capacity overload, but is less direct for the issue at hand: traffic priority cannot compensate for unusable wireless link quality.
This would be a reasonable check when a campus link carries video and backups, and strict high-priority queuing lets video consume bandwidth without a configured limit, but is less direct for the issue at hand: traffic priority cannot compensate for unusable wireless link quality.
This would be a reasonable check when an application experiences 20 ms average latency but bursts to 250 ms during each storage transfer, causing user complaints, but is less direct for the issue at hand: traffic priority cannot compensate for unusable wireless link quality.