ACMA Wireless Fundamentals 3

Question 1

How many non-overlapping 20 MHz channels are available in the 2.4 GHz band in the United States?

Accepted Answer

3

Answer

In the US, only channels 1, 6, and 11 are non-overlapping 20 MHz channels in the 2.4 GHz band.

Question 2

Which regulatory body governs the unlicensed use of wireless frequencies in the United States?

Accepted Answer

FCC

Answer

The Federal Communications Commission (FCC) regulates unlicensed spectrum use in the US, including the 2.4, 5, and 6 GHz bands.

Question 3

What is the primary role of the Distribution System (DS) in an 802.11 BSS architecture?

Accepted Answer

To connect multiple APs and allow inter-BSS communication

Answer

The Distribution System interconnects BSSs within an ESS, typically implemented as a wired Ethernet backbone.

Question 4

What type of antenna radiates power equally in all directions in the horizontal plane, like a donut shape?

Accepted Answer

Omnidirectional antenna

Answer

An omnidirectional antenna radiates power in a 360-degree pattern horizontally, making it ideal for providing coverage in all directions.

Question 5

Which 802.11 frame type is responsible for carrying user data across the wireless medium?

Accepted Answer

Data frame

Answer

Data frames carry the actual payload (user data) between stations in an 802.11 network.

(ACMA) Aruba Certified Mobility Associate Practice Test