CWS 802.11 Standards and Protocols Flashcards

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

Answer: 802.11s

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

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

Answer: 160 MHz

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

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

Answer: 1024-QAM

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

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

Answer: Quality of Service (QoS)

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

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

Answer: 3200 ns

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.

802.11p is a variant of 802.11 designed specifically for use in which environment?

Answer: Vehicular networks (V2X)

802.11p (WAVE – Wireless Access in Vehicular Environments) is designed for vehicle-to-vehicle and vehicle-to-infrastructure communications.

Which 802.11 standard first introduced MIMO (Multiple Input, Multiple Output) antenna technology?

Answer: 802.11n

802.11n was the first standard to formally incorporate MIMO, supporting up to 4 spatial streams to increase throughput and reliability.