CWS CWS 802.11 Standards and Protocols 2

Question 1

Which 802.11 amendment introduced the concept of mesh networking (MBSS)?

Accepted Answer

802.11s

Answer

802.11s introduced the Mesh Basic Service Set (MBSS) architecture enabling self-forming, self-healing wireless mesh networks.

Question 2

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

Accepted Answer

160 MHz

Answer

802.11ac Wave 2 supports up to 160 MHz channel widths (either contiguous or as two 80 MHz non-contiguous segments).

Question 3

Which modulation scheme achieves the highest data rates in 802.11ax (Wi-Fi 6)?

Accepted Answer

1024-QAM

Answer

802.11ax introduced 1024-QAM, encoding 10 bits per symbol to achieve higher throughput compared to the 256-QAM used in 802.11ac.

Question 4

The 802.11e amendment primarily addressed which aspect of wireless networking?

Accepted Answer

Quality of Service (QoS)

Answer

802.11e added QoS mechanisms including EDCA and HCCA to prioritize traffic types such as voice and video.

Question 5

What is the guard interval introduced by 802.11ax to improve efficiency in dense environments?

Accepted Answer

3200 ns

Answer

802.11ax introduced a 3200 ns guard interval option (in addition to 800 ns and 1600 ns) to better handle multipath in outdoor and dense deployments.

CWS Exam Practice Test