Exam 350-401 topic 1 question 815 discussion

A. dBi (decibels isotropic) - Used to measure the gain of an antenna compared to an isotropic radiator. B. dB (decibels) - Used to measure the signal-to-noise ratio (SNR) in wireless RF communication. C. dBm (decibel-milliwatts) - Used to measure the absolute power level of a signal relative to 1 milliwatt. D. mW (milliwatts) - Used to measure absolute power level directly, without using a logarithmic scale like dB or dBm.

dB its to SNR https://documentation.meraki.com/MR/Wi-Fi_Basics_and_Best_Practices/Signal-to-Noise_Ratio_(SNR)_and_Wireless_Signal_Strength

SNR is a RATIO of identical units so the units cancel out and thus the correct answer is B

B is correct

B is correct

The difference between the signal and the noise is called the signal-to-noise ratio (SNR), measured in dB.

SNR in dB

SNR is in dB

bBm is for RSSI power that can be measured in W. dB is the difference between RSSI leves. Answer is B

i think it also B https://documentation.meraki.com/MR/Wi-Fi_Basics_and_Best_Practices/Signal-to-Noise_Ratio_(SNR)_and_Wireless_Signal_Strength

From that link it says dB answer needs to be B.

C looks correct https://www.sonicwall.com/support/knowledge-base/rf-basic-background-signal-strength-and-snr/170505562736646/#:~:text=SNR%20(Signal%20to%20Noise%20Radio,to%20be%20considered%20during%20deployment.