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CWS 802.11 Standards and Protocols Flashcards

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

Read the first 7 CWS 802.11 Standards and Protocols flashcards as text

  1. Which 802.11 amendment introduced the 6 GHz band for Wi-Fi operation?

    Answer: 802.11ax with 6 GHz (Wi-Fi 6E)

    Wi-Fi 6E is the industry name for 802.11ax devices that also operate in the newly opened 6 GHz band, providing additional spectrum and reducing congestion.

  2. What is the maximum number of spatial streams supported by 802.11ac?

    Answer: 8

    802.11ac supports up to 8 spatial streams with MU-MIMO, though real-world deployments typically use 3–4 streams.

  3. In the context of 802.11 DCF, what does the acronym DIFS stand for?

    Answer: Distributed Inter-Frame Space

    DIFS (Distributed Inter-Frame Space) is the minimum idle time a station must wait before attempting a transmission using the DCF contention method.

  4. Which statement correctly describes 802.11 frame aggregation?

    Answer: A-MSDU and A-MPDU bundle multiple frames to reduce per-frame overhead

    A-MSDU (Aggregate MAC Service Data Unit) and A-MPDU (Aggregate MAC Protocol Data Unit) were introduced in 802.11n to bundle frames, reducing header and acknowledgment overhead.

  5. What is the purpose of the 802.11k Radio Resource Management (RRM) amendment?

    Answer: Enable STAs to report channel and neighbor AP measurements to aid roaming decisions

    802.11k allows APs to collect radio measurement reports from clients, providing neighbor lists and signal data that help clients make smarter, faster roaming decisions.

  6. What frequency band does 802.11ad (WiGig) operate in?

    Answer: 60 GHz

    802.11ad operates in the 60 GHz mmWave band, offering multi-gigabit speeds over very short distances with minimal wall penetration.

  7. During an active scan, a 802.11 client transmits which frame type to discover nearby APs?

    Answer: Probe Request

    During active scanning, the client sends Probe Request frames; nearby APs respond with Probe Response frames containing BSS capability information.