300-360 · Question #189
Which two modifications to station behaviors were designed in the IEEE 802.11e protocol? (Choose two.)
The correct answer is B. HCCA C. EDCA. IEEE 802.11e is the QoS amendment to the original 802.11 standard, introducing the Hybrid Coordination Function (HCF) with two access mechanisms: (C) EDCA (Enhanced Distributed Channel Access)-an enhancement of the original DCF that introduces traffic priority queues (Access…
Question
Which two modifications to station behaviors were designed in the IEEE 802.11e protocol? (Choose two.)
Options
- ACFP
- BHCCA
- CEDCA
- DPCF
- EDCF
How the community answered
(19 responses)- A11% (2)
- B84% (16)
- E5% (1)
Explanation
IEEE 802.11e is the QoS amendment to the original 802.11 standard, introducing the Hybrid Coordination Function (HCF) with two access mechanisms: (C) EDCA (Enhanced Distributed Channel Access)-an enhancement of the original DCF that introduces traffic priority queues (Access Categories: voice, video, best-effort, background) for contention-based, QoS-aware channel access; and (B) HCCA (HCF Controlled Channel Access)-a polling-based mechanism that gives the HC (Hybrid Coordinator) controlled, scheduled access to the medium for time-sensitive traffic. The original 802.11 mechanisms-DCF (E), PCF (D), and CFP (A)-predate 802.11e and were not introduced by it; 802.11e replaced/enhanced them.
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