A network technician is deploying a 5 GHz wireless network in a location near a weather radar installation. To comply with regulations and prevent interference, the access points must be able to automatically detect the radar signals and switch to a different channel. Which IEEE standard provides this capability through mechanisms like Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC)?
The correct answer is 802.11h. This amendment to the 802.11 standard was specifically created to manage spectrum and power in the 5 GHz band to avoid interference with other systems, such as military, weather, or satellite radar. It accomplishes this using Dynamic Frequency Selection (DFS), which detects radar signals and moves the Wi-Fi network to a clear channel, and Transmit Power Control (TPC), which adjusts signal strength to the minimum necessary. 802.11i is incorrect as it deals with security enhancements (WPA2). 802.11e is incorrect because it focuses on Quality of Service (QoS) for traffic prioritization. 802.11ac is a wireless networking protocol, and while devices using it in the 5 GHz band must adhere to 802.11h regulations, 802.11h is the standard that specifically defines the DFS and TPC mechanisms.
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What are Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC)?
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Why is it important to avoid interference with military and satellite radar systems?
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How does 802.11h impact Wi-Fi performance in areas with radar systems?