300-360 · Question #181
Which option is an enhancement of enabling WMM on an AP?
The correct answer is C. Each access class has its own IEEE 802.11 sequence number. WMM (Wi-Fi Multimedia, based on IEEE 802.11e) introduces four Access Categories (AC_VO Voice, AC_VI Video, AC_BE Best Effort, AC_BK Background). A key enhancement when WMM is enabled is that each access category maintains its own independent IEEE 802.11 sequence number space…
Question
Which option is an enhancement of enabling WMM on an AP?
Options
- AAll access classes use the same IEEE 802.11 sequence number.
- BIt disables U-APSD Power Save.
- CEach access class has its own IEEE 802.11 sequence number.
- DCAC is reserved for voice calls only.
How the community answered
(23 responses)- B4% (1)
- C91% (21)
- D4% (1)
Explanation
WMM (Wi-Fi Multimedia, based on IEEE 802.11e) introduces four Access Categories (AC_VO Voice, AC_VI Video, AC_BE Best Effort, AC_BK Background). A key enhancement when WMM is enabled is that each access category maintains its own independent IEEE 802.11 sequence number space. This prevents out-of-order delivery issues across traffic classes and improves per-queue management. Without WMM, all frames share one sequence number pool. Option A is incorrect (they do not share the same sequence number). Option B is wrong - WMM actually enables U-APSD power save. Option D is incorrect; CAC (Call Admission Control) is a separate feature not limited to voice.
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