Which of the following are the common source of WLAN interference? (Multiple choice)

Question

Options

• AMicrowave oven
• BRemote control
• Ccordless phone
• DBluetooth transmission device

• A
  71% (22)
• B
  29% (9)

Explanation

Microwave ovens (A), cordless phones (C), and Bluetooth devices (D) all operate in or near the 2.4 GHz frequency band - the same band used by most WLANs - causing direct radio frequency interference. Cordless phones often use 2.4 GHz or 5.8 GHz bands that overlap with Wi-Fi channels, while Bluetooth shares the exact 2.4 GHz ISM band and can cause packet collisions through a phenomenon called co-channel interference. Microwave ovens leak electromagnetic radiation at ~2.45 GHz during operation, temporarily disrupting nearby Wi-Fi signals.

Remote controls (B) are not a common source of WLAN interference because they typically use infrared (IR) light or very low-frequency RF signals (like 433 MHz), which are far outside the 2.4/5 GHz Wi-Fi spectrum and pose no meaningful interference.

Memory tip: Think "kitchen + cordless + cable-free" - anything in your home that's wireless and common (microwave, cordless phone, Bluetooth headset) is a potential Wi-Fi rival, but your TV remote aims a beam of light, not radio waves.

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