If the noise floor is -90 dBm and the client receives -75 dBm, what is the SNR (dB)?

Signal-to-Noise Ratio (SNR) is calculated by subtracting the noise floor from the received signal strength. In this case, the received signal strength is -75 dBm and the noise floor is -90 dBm. Therefore, SNR = -75 dBm - (-90 dBm) = -75 dBm + 90 dBm = 15 dB. A higher SNR indicates a stronger signal relative to the noise, which generally leads to better network performance. The options 1.2 and .83 are incorrect as they result from division, not subtraction. The option -165 is incorrect as it results from adding the two negative values, not subtracting the noise from the signal.