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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 802.11 amendment introduced OFDM (Orthogonal Frequency Division Multiplexing) to the 5 GHz band?

    Answer: 802.11a

    802.11a was the first amendment to use OFDM in the 5 GHz UNII bands, supporting data rates up to 54 Mbps.

  2. What is the maximum number of non-overlapping channels in the 2.4 GHz band in the United States?

    Answer: 3

    In the US 2.4 GHz band, only channels 1, 6, and 11 are non-overlapping, providing just 3 interference-free channels.

  3. Which 802.11 frame type is responsible for managing associations and authentications between clients and access points?

    Answer: Management frames

    Management frames handle network operations such as association, authentication, probing, and beacon advertisements.

  4. What mechanism does 802.11 use to avoid collisions in the shared wireless medium?

    Answer: CSMA/CA

    802.11 uses CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) because collisions cannot be detected on wireless links as they are on Ethernet.

  5. What is the purpose of the RTS/CTS mechanism in 802.11?

    Answer: Mitigate the hidden node problem

    RTS/CTS (Request to Send / Clear to Send) reserves the wireless medium before data transmission, solving the hidden node problem.

  6. Which 802.11 amendment was the first to introduce channel bonding, combining two 20 MHz channels into a 40 MHz channel?

    Answer: 802.11n

    802.11n (Wi-Fi 4) introduced 40 MHz channel bonding to increase throughput beyond what a single 20 MHz channel could support.

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