CWNA Technology & Digital Applications 2

Question 1

Which Wi-Fi generation introduced OFDMA to improve multi-user efficiency in dense environments?

Accepted Answer

Wi-Fi 6 (802.11ax)

Answer

Wi-Fi 6 (802.11ax) introduced OFDMA, allowing multiple users to share a channel simultaneously by dividing it into resource units.

Question 2

A hospital deploys wireless systems for medical telemetry. Which frequency band is specifically reserved by the FCC for wireless medical telemetry?

Accepted Answer

608–614 MHz and 1395–1400 MHz WMTS bands

Answer

The FCC designates Wireless Medical Telemetry Service (WMTS) bands including 608–614 MHz and 1395–1400 MHz specifically for medical telemetry devices.

Question 3

What does the term 'BSS Coloring' in 802.11ax help accomplish?

Accepted Answer

Reduces co-channel interference by tagging frames from different BSSs

Answer

BSS Coloring adds a color identifier to 802.11ax frames so devices can distinguish overlapping BSSs and reduce unnecessary deferrals, improving spatial reuse.

Question 4

In a Wi-Fi 6E deployment, which spectrum is made available that was not in Wi-Fi 6?

Accepted Answer

6 GHz band (5.925–7.125 GHz)

Answer

Wi-Fi 6E extends 802.11ax operation into the newly opened 6 GHz band, providing 1.2 GHz of additional spectrum with up to 59 non-overlapping 20 MHz channels.

Question 5

Which modulation scheme does 802.11ax support that 802.11ac does not, enabling higher throughput in favorable RF conditions?

Accepted Answer

1024-QAM

Answer

802.11ax supports 1024-QAM, encoding 10 bits per symbol versus 8 bits with 256-QAM, providing up to 25% higher peak throughput in high-SNR conditions.

CWNA - Wireless Network Administrator Practice Test

CWNA - Wireless Network Administrator Practice Test

CWNA Technology & Digital Applications 2