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A customer has recently implemented a new wireless infrastructure using WLC-5520s at a site directly next to a large commercial airport. Users report that they intermittently lose Wi-Fi connectivity, and troubleshooting reveals it is due to frequent channel changes. Which two actions fix this issue? (Choose two.)
Correct Answer: A,C
In the 5GHz spectrum some of the channels used by 802.11 are subject to Dynamic Frequency Selection (DFS) requirements. This is due to our clients coexistence with other RF technologies such as Maritime, Aviation and Weather RADAR. Dynamic Frequency Selection (DFS) is the process of detecting radar signals that must be protected against interference from 5.0 GHz (802.11a/h) radios, and upon detection switch ng the operating frequency of the 5.0 GHz (802.11a/h) radio to one that is not interfering with he radar systems. Reference: https://www.cisco.com/en/US/docs/routers/access/wireless/software/guide/RadioChannelDFS.pdf Although DFS helps reduce interference with radar systems but "DFS channels" refer to the 5GHz channels that require DFS check. In other words, DFS channels are channels that may interfere with radar signal. Therefore we should disable these DFS channels > Answer C is correct. UNII-2 (5.250-5.350 GHz and 5.470-5.725 GHz) which conta ns channels 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, and 140 are permitted in the United States, but shared with radar systems. Therefore, APs operating on UNII-2 channels are required to use Dynamic Frequency Selection (DFS) to avoid interfering with radar signals. If an AP detects a radar signal, it must immediately stop using that channel and randomly pick a new channel. Reference: https://documentation.meraki.com/MR/WiFi Basics and Best Practices/Channel Planning Best P ractices