What are two common sources of interference for Wi-Fi networks? (Choose two.)

Question

Options

• Aradar
• BLED lights
• Crogue AP
• Dconventional oven
• Efire alarm

• A
  88% (22)
• D
  8% (2)
• E
  4% (1)

Explanation

Radar (A) causes interference with Wi-Fi because certain radar systems operate in the 5 GHz frequency band, the same band used by 802.11a/n/ac Wi-Fi. This is why the Dynamic Frequency Selection (DFS) protocol exists - to detect radar signals and automatically shift Wi-Fi channels to avoid conflicts. Rogue APs (C) are unauthorized access points that interfere with legitimate Wi-Fi networks by competing for the same channels, creating signal congestion, and potentially causing security vulnerabilities. LED lights, conventional ovens, and fire alarms do not emit signals in the 2.4 GHz or 5 GHz frequency bands used by Wi-Fi - note that microwave ovens (not conventional/regular ovens) do cause interference, so watch for that distractor swap on the exam.

Memory Tip: Think "RF enemies" - Wi-Fi is hurt by things that share its radio frequency spectrum. Radar shares the 5 GHz band, and rogue APs literally compete on the same Wi-Fi channels. If a device doesn't transmit radio waves near 2.4/5 GHz, it's not a Wi-Fi interferer.

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