ACMA RF Principles 4

Question 1

What type of RF interference occurs when two APs operate on overlapping channels in the same area?

Accepted Answer

Adjacent channel interference

Answer

Adjacent channel interference occurs when two APs operate on channels whose frequency ranges partially overlap, causing cross-channel signal degradation.

Question 2

What is the primary advantage of using a directional antenna over an omnidirectional antenna?

Accepted Answer

Directional antennas focus RF energy in a specific direction, providing greater range and gain

Answer

Directional antennas concentrate RF energy into a focused beam, increasing range and reducing interference from unwanted directions.

Question 3

What does SNR (Signal-to-Noise Ratio) measure in a wireless network?

Accepted Answer

The difference in dB between the received signal strength and the background noise floor

Answer

SNR is the difference between the received signal level and the noise floor in dB; a higher SNR indicates a cleaner, more reliable wireless connection.

Question 4

Which 2.4 GHz channels are considered non-overlapping in North America?

Accepted Answer

1, 6, 11

Answer

In North America, channels 1, 6, and 11 are the only three non-overlapping channels in the 2.4 GHz band, each separated by 25 MHz.

Question 5

What is RF refraction in wireless networking?

Accepted Answer

The bending of RF signals as they pass through materials with different densities

Answer

RF refraction is the bending of a radio wave as it passes through mediums of different densities, similar to how light bends through water or glass.

(ACMA) Aruba Certified Mobility Associate Practice Test

(ACMA) Aruba Certified Mobility Associate Practice Test

ACMA RF Principles 4