Question 220
At a hospital campus, an issue has been corrected: A hospital complains that an outdoor 5 GHz AP disappears from a channel after a detected weather-radar event. Which repeatable control should the team add to prevent it from returning?
Explanation
Correct Answer
Review DFS behavior and alternate-channel capacity in outdoor WLAN designs. This repeatable safeguard addresses the mechanism—dynamic Frequency Selection requires avoidance of radar-occupied spectrum rather than forced reuse—and reduces the chance that the specific fault recurs.
Incorrect Answers
Segment client capabilities by band before declaring a 6 GHz-only transition. This protects against another issue—a network plan assigns every Wi-Fi 6E client to 6 GHz despite a large inventory of 5 GHz-only laptops—but is not the most direct prevention for a hospital complains that an outdoor 5 GHz AP disappears from a channel after a detected weather-radar event.
Trend retry percentage and aggregation outcomes alongside reported link rate. This protects against another issue—a network reporting tool reads a high PHY rate despite frequent retransmitted aggregates on a noisy WLAN—but is not the most direct prevention for a hospital complains that an outdoor 5 GHz AP disappears from a channel after a detected weather-radar event.
Review client supported widths and neighboring-channel reuse before standardizing 160 MHz. This protects against another issue—an engineer specifies a 160 MHz channel for a congested site but most clients support only 40 or 80 MHz operation—but is not the most direct prevention for a hospital complains that an outdoor 5 GHz AP disappears from a channel after a detected weather-radar event.