220-801 Question #2: Real Exam Question with Answer & Explanation

The correct answer is A: 1,6,11. In the 2.4 GHz band, channels are each 22 MHz wide and spaced only 5 MHz apart. This means most channels overlap with their neighbors. Only channels 1, 6, and 11 are spaced far enough apart (25 MHz between center frequencies) to be completely non-overlapping. Using these three ch

Question

Which of the following lists the correct non-overlapping channels in 2.4 GHz?

Options

A1,6,11
B2,4,6,8,10
C3,6,9
D5,11

Explanation

In the 2.4 GHz band, channels are each 22 MHz wide and spaced only 5 MHz apart. This means most channels overlap with their neighbors. Only channels 1, 6, and 11 are spaced far enough apart (25 MHz between center frequencies) to be completely non-overlapping. Using these three channels for adjacent access points prevents co-channel interference. In some regions, channels 1, 5, 9, and 13 can also be non-overlapping, but 1/6/11 is the standard for the US and most of the world.

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