H12-311_V3.0 · Question #250
Which channels in the 802.11b protocol are non-overlapping? (Multiple choice)
The correct answer is A. 1 C. 6 D. 11. In 802.11b's 2.4 GHz band, channels 1, 6, and 11 are the three non-overlapping channels because they are each spaced 25 MHz apart - wide enough that their 22 MHz-wide signals do not interfere with one another. Channel 3 (choice B) is the distractor: it falls between channels 1…
Question
Which channels in the 802.11b protocol are non-overlapping? (Multiple choice)
Options
- A1
- B3
- C6
- D11
How the community answered
(32 responses)- A72% (23)
- B28% (9)
Explanation
In 802.11b's 2.4 GHz band, channels 1, 6, and 11 are the three non-overlapping channels because they are each spaced 25 MHz apart - wide enough that their 22 MHz-wide signals do not interfere with one another. Channel 3 (choice B) is the distractor: it falls between channels 1 and 6, overlapping with both, and using it alongside either would cause co-channel interference. This 1-6-11 arrangement is the standard deployment pattern for wireless networks to maximize coverage without signal collision.
Memory tip: Think "1, 6, 11 - one, six, eleven" as a countdown: they're evenly spaced across the band just like a timer counting down. If you remember there are only 3 non-overlapping channels in 2.4 GHz 802.11b/g/n, the three choices with 5-channel gaps between them (1→6→11) are the only ones that fit.
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