In Wi-Fi, how is 'noise' defined?
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Correct answer: any interference that is not Wi‑Fi traffic that degrades the desired signal.
Why this is the answer
In Wi-Fi, noise refers to any unwanted electrical interference that is not Wi-Fi traffic itself but still degrades the quality of the desired Wi-Fi signal. This can include interference from microwave ovens, cordless phones, Bluetooth devices, or even electrical motors. High noise levels reduce the signal-to-noise ratio (SNR), making it harder for Wi-Fi devices to reliably decode data. The first incorrect option describes co-channel interference or adjacent channel interference, which is a type of Wi-Fi interference, not general noise. The third option is a specific type of Wi-Fi interference, similar to the first. The fourth option describes the signal-to-noise ratio (SNR), which is a measurement of signal quality in the presence of noise, not the definition of noise itself.
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