Discussion
How many non-overlapping channels are available with 802.11b?
Answer: A
Correct answer: 3
The 2.4 GHz band holds eleven channels in North America but each is 22 MHz wide against a 5 MHz spacing, so adjacent channels overlap heavily. Only channels 1, 6 and 11 are far enough apart not to interfere. That figure of three is the fundamental constraint on 2.4 GHz deployment: cells must be laid out so that no two neighbours share a channel.
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