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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. What is the role of the Distribution System (DS) in 802.11 architecture?

    Answer: Interconnects multiple BSSs to form an Extended Service Set (ESS)

    The Distribution System interconnects APs and bridges 802.11 frames to the wired backbone, allowing multiple BSSs to form a single ESS with seamless Layer 2 connectivity.

  2. Which 802.11 feature allows an AP to steer a dual-band capable client from 2.4 GHz to 5 GHz?

    Answer: BSS Transition Management (802.11v)

    802.11v BSS Transition Management lets APs send suggestions or requests to clients to transition to a different BSS, which can include steering to a less congested or higher-frequency band.

  3. What is the maximum theoretical throughput of 802.11g?

    Answer: 54 Mbps

    802.11g achieves a maximum PHY rate of 54 Mbps using OFDM in the 2.4 GHz band, matching the speed of 802.11a in the 5 GHz band.

  4. Which channel access method is mandatory for all 802.11 STAs and serves as the baseline for medium contention?

    Answer: DCF (Distributed Coordination Function)

    DCF is the mandatory baseline medium access method based on CSMA/CA with random backoff, required for all 802.11 compliant stations.

  5. What does a STA do when it detects a 'hidden node' problem cannot be solved passively?

    Answer: Enables RTS/CTS handshake to reserve the medium before transmitting

    RTS/CTS allows a transmitting station to reserve the medium; the CTS frame is heard by stations that cannot hear the original sender, preventing collisions.

  6. Which element in a 802.11 Beacon frame tells clients the interval at which Beacons are transmitted?

    Answer: Beacon Interval field

    The Beacon Interval field specifies the time between successive Beacon transmissions in units of Time Units (TUs), where 1 TU = 1024 microseconds.

  7. In 802.11ax, what does 'Target Wake Time' (TWT) primarily accomplish?

    Answer: Negotiates scheduled wake intervals so IoT/battery devices sleep longer and reduce channel contention

    TWT allows an AP and client to negotiate specific times for the client to wake and communicate, dramatically improving battery life for IoT devices and reducing simultaneous channel contention.