Which of the following options are EDCA parameters (Select 2 Answers)?

Question

Options

• AAIFSN
• BSIFS
• CDIFS
• DTXOPLimit

• A
  70% (19)
• B
  11% (3)
• C
  19% (5)

Explanation

EDCA (Enhanced Distributed Channel Access) defines per-Access-Category (AC) parameters that allow Wi-Fi to prioritize different traffic types. AIFSN (Arbitration Inter-Frame Space Number) is a core EDCA parameter that sets the inter-frame spacing per AC, replacing the legacy DIFS with a tunable value. TXOPLimit is equally central - it caps how long a station can hold the channel after winning contention, again configured per AC.

SIFS (B) is wrong because it's a fixed, hardware-level spacing used for ACKs and block ACKs - it's not configurable per AC and predates EDCA entirely. DIFS (C) is the legacy IFS from the original DCF mechanism; EDCA specifically replaced DIFS with AIFS (derived from AIFSN), so DIFS itself is not an EDCA parameter.

Memory tip: The four EDCA parameters per Access Category spell "ACCT" - AIFSN, CWmin, CWmax, TXOPLimit. If you see SIFS or DIFS on an exam, those belong to legacy 802.11 timing mechanics, not EDCA's per-AC tuning knobs.

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