Among the following priority queues, which of the following queue has the highest default priority?

Question

Options

• AAC-BE
• BAC-VI
• CAC-VO
• DAC-BK

• A
  14% (6)
• B
  2% (1)
• C
  77% (34)
• D
  7% (3)

Explanation

AC-VO (Voice) carries the highest default priority among the four WMM (Wi-Fi Multimedia) access categories because voice traffic demands the lowest latency and least jitter of all traffic types, and the 802.11e standard assigns it the shortest contention window and AIFS values to reflect this. AC-VI (Video) is the second-highest priority, not the highest, since video can tolerate slightly more delay than live voice. AC-BE (Best Effort) sits at third priority and handles general data traffic with no quality-of-service guarantees. AC-BK (Background) is the lowest priority of all, intended for bulk transfers like file downloads that can tolerate significant delay without impacting user experience.

Memory tip: Rank the four categories by how sensitive they are to delay in real life. A phone call breaks instantly with lag (VO = highest), a video stream stutters but recovers (VI = second), a web page load is noticeable but tolerable (BE = third), and a background file sync is invisible to the user (BK = lowest). The acronyms VO, VI, BE, BK map directly to that order from most to least time-sensitive.

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