Which CleanAir feature is used to avoid channels with interference from devices such as outdoor...

Cisco CleanAir technology is designed to detect, classify, and mitigate RF interference in enterprise wireless networks. Persistent Device Avoidance is a CleanAir feature that identifies non-Wi-Fi sources of interference, such as microwave ovens, outdoor bridges, or other RF devices, and then instructs the wireless LAN controller (WLC) to avoid channels affected by these interferers. By doing so, APs can select cleaner channels, reducing packet loss, improving throughput, and maintaining optimal coverage. Spectrum Analysis (Option B) provides visibility into the RF environment and interference sources but does not automatically avoid channels. Air Quality Index (Option C) gives a real-time assessment of RF quality per channel but is a monitoring metric, not an avoidance mechanism. Channel Utilization (Option D) reports on the percentage of channel occupancy by Wi-Fi traffic, assisting in load balancing, but does not prevent interference from external sources. Persistent Device Avoidance ensures proactive channel selection in environments with consistent interference, enhancing overall network reliability and performance. This capability is critical in high-density or mixed-use environments, where interference from non-Wi-Fi devices can degrade client experience. Reference topics:Wireless Network Operation — Cisco CleanAir, Persistent Device Avoidance, RF interference mitigation, channel optimization.