CWT Wireless Standards & Radio Frequency Fundamentals 2

Question 1

Which IEEE 802.11 amendment introduced OFDMA as a key feature for improved multi-user efficiency?

Accepted Answer

802.11ax

Answer

802.11ax (Wi-Fi 6) introduced Orthogonal Frequency Division Multiple Access (OFDMA), allowing simultaneous transmission to multiple clients in the same channel.

Question 2

What is the primary frequency band used by Bluetooth Classic and Bluetooth Low Energy (BLE)?

Accepted Answer

2.4 GHz

Answer

Both Bluetooth Classic and BLE operate in the 2.4 GHz ISM band using frequency hopping spread spectrum.

Question 3

In RF propagation, what term describes signal power loss due to distance in free space?

Accepted Answer

Free-space path loss

Answer

Free-space path loss (FSPL) is the reduction in signal power as it travels through free space, increasing with both frequency and distance.

Question 4

Which modulation scheme is used by 802.11ax to achieve its highest data rates?

Accepted Answer

1024-QAM

Answer

802.11ax (Wi-Fi 6) uses 1024-QAM, encoding 10 bits per symbol to achieve higher throughput compared to the 256-QAM of Wi-Fi 5.

Question 5

What does the term 'channel bonding' refer to in wireless networking?

Accepted Answer

Aggregating adjacent channels to increase bandwidth

Answer

Channel bonding combines two or more adjacent channels to create a wider channel (e.g., 40, 80, or 160 MHz) for higher throughput.

(CWT) Certified Wireless Technician Practice Test

(CWT) Certified Wireless Technician Practice Test

CWT Wireless Standards & Radio Frequency Fundamentals 2