Which QoS concept is described as using access categories based on the IEEE 802.11e QoS standard?

Which QoS concept is described as using access categories based on the IEEE 802.11e QoS standard?

• A. Best Efforts Service
• B. Class of Service
• C. Differentiated Services
• D. WMM

Answer: (D)

WMM is the WLAN QoS mechanism that uses access categories defined by IEEE 802.11e. IEEE 802.11e introduces EDCA with four access categories to prioritize traffic: Voice, Video, Best Effort, and Background. By placing traffic into these categories, the wireless medium can arbitrate access more aggressively for time‑sensitive streams (like voice and video) using different contention parameters, which is exactly what “using access categories based on the IEEE 802.11e QoS standard” describes. The other concepts operate in different contexts: Best Efforts Service represents non‑guaranteed delivery without explicit WLAN QoS categorization; Class of Service is a term from other domains like VLAN/802.1Q tagging; Differentiated Services (DS) refers to IP-layer QoS using DSCP, not the WLAN access-category approach. So the WLAN‑specific QoS concept that relies on 802.11e access categories is WMM.

WMM is the WLAN QoS mechanism that uses access categories defined by IEEE 802.11e. IEEE 802.11e introduces EDCA with four access categories to prioritize traffic: Voice, Video, Best Effort, and Background. By placing traffic into these categories, the wireless medium can arbitrate access more aggressively for time‑sensitive streams (like voice and video) using different contention parameters, which is exactly what “using access categories based on the IEEE 802.11e QoS standard” describes.

The other concepts operate in different contexts: Best Efforts Service represents non‑guaranteed delivery without explicit WLAN QoS categorization; Class of Service is a term from other domains like VLAN/802.1Q tagging; Differentiated Services (DS) refers to IP-layer QoS using DSCP, not the WLAN access-category approach. So the WLAN‑specific QoS concept that relies on 802.11e access categories is WMM.