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

In the 2.4 GHz frequency band used for 802.11 wireless networks, the channel bandwidth is typically

20 MHz, but the actual frequency spread of each channel is about 22 MHz due to the modulation

techniques used. This spread causes overlap between adjacent channels, which can lead to

interference and degrade network performance. To avoid this, it's essential to use non-overlapping

channels.

The three non-overlapping channels in the 2.4 GHz band are 1, 6, and 11. Each of these channels is

spaced sufficiently apart to avoid interference with each other:

Channel 1: Centered at 2.412 GHz.

Channel 6: Centered at 2.437 GHz.

Channel 11: Centered at 2.462 GHz.

Given the options provided, option C (1 and 5) is the closest to a pair of non-overlapping channels,

although in practice, channel 5 would still cause some interference with channel 1 due to the 22 MHz

spread. The ideal choice for non-overlapping channels would be any two channels among 1, 6, and

11, but this is not an option provided. Therefore, within the given options, 1 and 5 are the best

choice, understanding that in a real-world scenario, 1 and 6 or 6 and 11 would be preferred to avoid

overlap.

Reference:

CWNA Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109, by David D.

Coleman and David A. Westcott.

Understanding 2.4 GHz channel arrangement and interference patterns in 802.11 wireless networks.