When the distance between the center frequencies of two channels is less than or equal to 25MHz, there will be overlapping areas between the channels, and there will be some interference. Therefore…

Question

Options

• ATrue
• BFalse

• A
  23% (13)
• B
  77% (44)

Explanation

B is correct because the statement conflates two distinct types of wireless interference and draws a faulty conclusion. Adjacent-channel interference occurs when two different channels are too close in frequency (within ~25 MHz), causing their signals to overlap - the fix is to choose channels spaced more than 25 MHz apart, such as Wi-Fi 2.4 GHz channels 1, 6, and 11. Restricting the same channel from adjacent areas addresses co-channel interference, which is an entirely separate problem caused by identical frequencies competing in overlapping coverage zones.

Option A is wrong because it accepts the statement as logically sound, when in fact it mixes up the cause (adjacent-channel overlap) with a solution that targets a different problem (co-channel reuse). The conclusion simply doesn't follow from the stated premise.

Memory tip: Think of it as two neighbors - "adjacent-channel" interference is like two neighbors playing different songs at nearly the same volume and frequency, bleeding into each other; "co-channel" interference is like two neighbors playing the exact same song simultaneously. The question describes the first problem but prescribes the second as the solution - a category mismatch that makes the statement false.

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