What statement about the IEEE 802.11e QoS facility is true?
802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.
Four 802.1p user priorities are mapped to eight 802.11 transmit queues.
When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.
To improve efficiency, Block Acknowledgments are required for Voice and Video WMM queues.
802.11 control frames are assigned to the 802.11 EF priority queue.
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