ACMA Wireless Networking Fundamentals & Technologies 2

Question 1

Which 802.11 amendment introduced OFDMA as the primary multiple-access scheme for Wi-Fi?

Accepted Answer

802.11ax

Answer

802.11ax (Wi-Fi 6) introduced Orthogonal Frequency Division Multiple Access (OFDMA), enabling simultaneous transmission to multiple clients.

Question 2

What is the maximum number of spatial streams supported by 802.11ac Wave 2?

Accepted Answer

8

Answer

802.11ac Wave 2 supports up to 8 spatial streams using MU-MIMO, enabling higher aggregate throughput.

Question 3

In 802.11 terminology, what is the role of the Distribution System (DS)?

Accepted Answer

It interconnects access points within an ESS

Answer

The Distribution System connects multiple APs together to form an Extended Service Set (ESS), enabling roaming between APs.

Question 4

What guard interval option did 802.11ax introduce that was NOT available in 802.11ac?

Accepted Answer

3200 ns

Answer

802.11ax introduced a 3200 ns guard interval to handle outdoor and high-multipath environments with longer delay spreads.

Question 5

Which band characteristic makes the 5 GHz frequency range generally preferable for high-throughput applications compared to 2.4 GHz?

Accepted Answer

More non-overlapping channels and less interference

Answer

The 5 GHz band offers more non-overlapping channels and significantly less co-channel interference from other Wi-Fi and non-Wi-Fi devices.

(ACMA) Aruba Certified Mobility Associate Practice Test