In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

Question

Options

• A7 and 11
• B2 and 8
• C1 and 5
• D4 and 6

• A
  5% (2)
• B
  76% (28)
• C
  14% (5)
• D
  5% (2)

Explanation

Option B is correct because channels 2 and 8 are 6 channels apart, giving a 30 MHz separation (6 × 5 MHz/channel), which exceeds the 22 MHz channel width and ensures zero spectral overlap. The golden rule for non-overlapping 22 MHz channels in 2.4 GHz is a minimum 5-channel gap (25 MHz), and only channels 2 and 8 satisfy this among the choices.

• A (7 and 11): Only 4 channels apart (20 MHz) - they overlap.
• C (1 and 5): Also only 4 channels apart (20 MHz) - they overlap.
• D (4 and 6): Just 2 channels apart (10 MHz) - heavily overlapping.

Memory tip: Anchor on the famous non-overlapping trio 1, 6, 11 (each exactly 5 channels apart). From there, recognize that any pair with at least a 5-channel gap is safe - channels 2 and 8 fit that rule with room to spare (6 apart), making B the only valid answer in this set.

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