Practice Quiz

CWNA Wireless Network Administrator

Category - CWNA

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Which of the following best defines a noise floor?
  1. The noise generated as a result of foot traffic
  2. The level of RF noise in the wireless LAN environment
  3. A fixed level of noise of -100 dBm in a wireless LAN
  4. The level of noise at which a wireless LAN starts working
Explanation
Answer - B - Noise floor is the level of RF noise in the wireless LAN environment.

Key Takeaway: Noise floor is a mixture of all of the background RF radiation found in the environment surrounding the wireless system in use. RF signals must be higher than the noise floor to be detectable by a receiver.
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