CWDP WLAN Standards and Protocols

Question 1

Which IEEE 802.11 amendment introduced OFDMA and target wake time (TWT)?

Accepted Answer

802.11ax (Wi-Fi 6)

Answer

IEEE 802.11ax (Wi-Fi 6) introduced Orthogonal Frequency Division Multiple Access (OFDMA) for efficient multi-user uplink/downlink and Target Wake Time (TWT) for improved power management.

Question 2

What is the primary advantage of MU-MIMO over SU-MIMO in wireless network design?

Accepted Answer

It allows the AP to communicate with multiple clients simultaneously

Answer

Multi-User MIMO allows an access point to transmit to or receive from multiple clients at the same time using spatial multiplexing, significantly improving network capacity in dense environments.

Question 3

What frequency bands does Wi-Fi 6E operate in?

Accepted Answer

2.4 GHz, 5 GHz, and 6 GHz

Answer

Wi-Fi 6E extends Wi-Fi 6 capabilities into the 6 GHz band while maintaining backward compatibility with 2.4 GHz and 5 GHz, providing up to 1200 MHz of additional spectrum.

Question 4

What is the purpose of BSS Coloring in 802.11ax?

Accepted Answer

To reduce co-channel interference by allowing devices to differentiate between their BSS and overlapping BSSs

Answer

BSS Coloring assigns a unique identifier (color) to each Basic Service Set, allowing devices to quickly determine if a detected frame belongs to their own BSS or an overlapping one, improving spatial reuse.

Question 5

What is the maximum channel width supported by 802.11ac Wave 2?

Accepted Answer

160 MHz

Answer

802.11ac Wave 2 supports channel widths up to 160 MHz (either contiguous or as 80+80 MHz non-contiguous), enabling higher throughput compared to Wave 1's maximum of 80 MHz.

Certified Wireless Design Professional (CWDP) Practice Test

Certified Wireless Design Professional (CWDP) Practice Test

CWDP WLAN Standards and Protocols