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802.11 Standards & Protocol Architecture Flashcards

6 cards from real CWNA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 802.11 Standards & Protocol Architecture flashcards as text

  1. Which Wi-Fi generation corresponds to the 802.11ax standard?

    Answer: Wi-Fi 6

    802.11ax is branded as Wi-Fi 6 (and Wi-Fi 6E when extended to the 6 GHz band), introducing OFDMA and BSS Coloring.

  2. What does the term 'BSS Coloring' introduced in 802.11ax help achieve?

    Answer: Reduce co-channel interference by tagging frames from different BSSs

    BSS Coloring tags frames with a color identifier so devices can distinguish transmissions from overlapping BSSs and reduce unnecessary deferrals.

  3. What is the function of the DCF (Distributed Coordination Function) in 802.11?

    Answer: Distributed contention-based channel access used by all stations

    DCF is the fundamental contention-based channel access method in 802.11, using CSMA/CA for all stations to share the medium.

  4. Which 802.11 amendment first introduced Quality of Service (QoS) through the WMM (Wi-Fi Multimedia) specification?

    Answer: 802.11e

    802.11e introduced the Enhanced Distributed Channel Access (EDCA) mechanism that became the basis for WMM QoS in Wi-Fi.

  5. What is the role of the DTIM (Delivery Traffic Indication Message) beacon field?

    Answer: Signal sleeping clients that buffered multicast/broadcast frames are ready

    DTIM beacons alert power-saving clients that multicast or broadcast frames are buffered at the AP and about to be sent.

  6. In 802.11ac (Wi-Fi 5), what is the maximum number of spatial streams supported?

    Answer: 8

    802.11ac supports up to 8 spatial streams with MU-MIMO, enabling significantly higher aggregate throughput compared to 802.11n's 4 streams.

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