350-401 Question 213

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• 1

  C it is, delta between the two values. Hypothetically speaking, if the device's radio receives a signal at -65 dBm (decibels per milliwatt), and the noise floor is -80 dBm, then the resulting signal to noise ratio is 15 dB. This would then reflect as a signal strength of 15 dB for this wireless connection. In terms of connectivity in wireless networks, the experts state a requirement of an SNR of at least 20 dB to say, surf the web. However, the following is SNR requirements versus SNR values: • 5 dB to 10 dB: is below the minimum level to establish a connection, due to the noise level being nearly indistinguishable from the desired signal (useful information). • 10 dB to 15 dB: is the accepted minimum to establish an unreliable connection. • 15 dB to 25 dB: is typically considered the minimally acceptable level to establish poor connectivity. • 25 dB to 40 dB: is deemed to be good. • 41 dB or higher: is considered to be excellent.

• 1

  85-67 is 18 simple deduction so -18

• Chose C2

  easy one, C