Which of the following statements about frequency planning is correct? (Multiple choice)

Question

Options

• A2.4GHz generally uses three non-overlapping channels 1, 6, and 11 for coverage
• BThere are generally 23 non-overlapping channels available on 5GHz in China
• CMicrowave oven interference will occur in the full frequency band of 2.4GHz
• DIf the AP is dual-band, it is recommended to use the 5G priority function

• A
  71% (40)
• B
  21% (12)
• C
  7% (4)

Explanation

Options A and D are correct because 2.4GHz Wi-Fi (802.11b/g/n) has channels that overlap significantly - only channels 1, 6, and 11 are spaced far enough apart (25 MHz each) to avoid mutual interference, making them the standard trio for co-located AP deployment. For dual-band APs, enabling 5G priority (band steering) is best practice because 5GHz offers more non-overlapping channels, less interference from neighboring networks and household devices, and higher throughput for capable clients.

Option B is wrong because China's 5GHz regulatory domain provides approximately 13 non-overlapping 20 MHz channels (e.g., 36–64 and 149–165), not 23. Twenty-three channels would exceed what China's spectrum allocation permits.

Option C is wrong because microwave ovens interfere primarily around 2.45 GHz - affecting the middle channels of the band - not uniformly across the entire 2.4 GHz spectrum. Channels 1 and 2 (near 2.412–2.417 GHz) are largely unaffected.

Memory tip: Picture the 2.4GHz band as a highway with only 3 lanes (1, 6, 11) that don't overlap - any other channel choice causes "lane merging." For dual-band APs, think "5 is alive" - push capable devices to 5GHz first for the best experience.

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