Preparing Practice Exam…
Please wait a moment while the system generates the exam questions, answers, and study session.
Please wait a moment while the system generates the exam questions, answers, and study session.
Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
How SNR (Signal-to-Noise Ratio) is Calculated: SNR = Signal Strength − Noise Floor SNR=Signal Strength−Noise Floor Given: Signal = −75 dBm Noise = −90 dBm SNR = ( − 75 ) − ( − 90 ) = − 75 + 90 = ∗ ∗ 15 d B ∗ ∗ SNR=(−75)−(−90)=−75+90=∗∗15dB∗∗
C: is correct https://www.omnicalculator.com/physics/signal-to-noise-ratio
To calculate the Signal-to-Noise Ratio (SNR), we need to convert the signal and noise power from dBm to linear scale (watts) and then use the SNR equation: SNR (dB) = 10 * log10(signal power / noise power) Given: Noise floor = -90 dBm Signal strength = 75 dBm First, let's convert the signal and noise power to watts: Signal Power (W) = 10^((Signal Strength (dBm) - 30) / 10) Signal Power (W) = 10^((75 - 30) / 10) Signal Power (W) = 10^4.5 Signal Power (W) = 31,622.7766 W Noise Power (W) = 10^((Noise Floor (dBm) - 30) / 10) Noise Power (W) = 10^((-90 - 30) / 10) Noise Power (W) = 10^-12 Noise Power (W) = 0.000000000001 W Now, let's calculate the SNR in dB: SNR (dB) = 10 * log10(signal power / noise power) SNR (dB) = 10 * log10(31,622.7766 / 0.000000000001) SNR (dB) = 10 * log10(31,622,776,600,000,000) SNR (dB) = 10 * 16.5 SNR (dB) = 165 Therefore, the SNR is 165 dB. The correct answer is C.