ACMA RF Principles 5

Question 1

What is the purpose of Transmit Power Control (TPC) in Aruba wireless networks?

Accepted Answer

To dynamically adjust AP transmit power to minimize co-channel interference while maintaining coverage

Answer

TPC automatically adjusts AP transmit power levels to reduce interference between APs while ensuring clients maintain sufficient coverage throughout the network.

Question 2

What RF characteristic determines how much an RF signal is scattered when it strikes a rough or irregular surface?

Accepted Answer

Scattering

Answer

Scattering occurs when RF signals strike irregular or rough surfaces, causing the energy to disperse in many directions rather than reflecting cleanly.

Question 3

Which of the following correctly describes the concept of half-power beamwidth for a directional antenna?

Accepted Answer

The angular width of the antenna's main lobe measured between the -3 dB points on each side

Answer

Half-power beamwidth is the angular width of an antenna's main lobe measured between the two points where power drops to half (-3 dB) of the peak value.

Question 4

What is diffraction in the context of RF propagation?

Accepted Answer

The ability of RF waves to bend around obstacles and edges

Answer

RF diffraction allows radio waves to bend around the edges of obstacles such as buildings or hills, enabling signals to reach areas not in the direct line of sight.

Question 5

In the 5 GHz band, approximately how many non-overlapping 20 MHz channels are available in the U.S. (including UNII-1, UNII-2, UNII-2e, and UNII-3)?

Accepted Answer

24

Answer

The 5 GHz band in the U.S. offers approximately 24 non-overlapping 20 MHz channels across the UNII-1, UNII-2, UNII-2e, and UNII-3 sub-bands.

(ACMA) Aruba Certified Mobility Associate Practice Test

(ACMA) Aruba Certified Mobility Associate Practice Test

ACMA RF Principles 5