An engineer has received CleanAir alarms for non-Wi-Fi interferers affecting the wireless network. Which OSI Layer does the engineer investigate to locale the source of these interferers?

Question

Options

• ALayer 1
• BLayer 2
• CLayer 3
• DLayer 7

• A
  2% (1)
• B
  90% (47)
• C
  2% (1)
• D
  6% (3)

Explanation

In the context of Cisco CleanAir technology, non-Wi-Fi interference (from devices such as Bluetooth radios, microwave ovens, cordless phones, or video cameras) is detected and classified at the MAC sublayer, which resides at Layer 2 (Data Link). CleanAir-enabled APs analyze the spectrum and report interference through the 802.11 MAC layer management framework, surfacing alarms via the Wireless LAN Controller (WLC) and Cisco Prime Infrastructure at Layer 2. The engineer investigates Layer 2 because the interference classification, device type identification, and location data are all correlated and presented through the MAC-layer management plane. While the RF energy itself is a physical phenomenon, the Cisco toolset surfaces and localizes the source through Layer 2 mechanisms and SSID/channel analysis workflows.

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