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If the noise floor is -90 dBm and wireless client is receiving a signal of -75 dBm, what is the SNR?
Correct Answer: A
Signal-to-Noise Ratio (SNR) is a measure used to quantify how much a signal has been corrupted by noise. It is defined as the ratio of signal power to the noise power, often expressed in decibels (dB). A higher SNR indicates a better quality of the signal. In this case, the SNR can be calculated by subtracting the noise floor from the signal level: [ \text{SNR (dB)} = \text{Signal (dBm)} - \text{Noise Floor (dBm)} ] [ \text{SNR} = -75 \text{ dBm} - (-90 \text{ dBm}) ] [ \text{SNR} = 15 \text{ dB} ]