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CWS WLAN Hardware and Antennas 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 WLAN Hardware and Antennas flashcards as text

  1. A Yagi antenna is best described as which type of antenna?

    Answer: Highly directional with multiple elements along a boom

    A Yagi antenna uses a driven element, reflector, and multiple director elements along a boom to achieve high gain in a single forward direction.

  2. What is co-channel interference (CCI) in a WLAN deployment?

    Answer: Interference between access points using the same channel

    Co-channel interference occurs when two or more access points operate on the same channel within range of each other, competing for airtime.

  3. Which cable type is preferred for connecting outdoor antennas to access points over long cable runs to minimize signal loss?

    Answer: Low-loss coaxial cable (e.g., LMR-400)

    Low-loss coaxial cables like LMR-400 have significantly lower attenuation per foot than standard cables, preserving signal strength over long outdoor runs.

  4. What is a patch antenna primarily used for in WLAN deployments?

    Answer: Directional coverage in a specific area like a hallway or outdoor sector

    Patch antennas provide directional coverage with moderate gain, commonly used for hallways, outdoor coverage sectors, and focused indoor zones.

  5. What is the significance of the Fresnel zone in outdoor wireless link planning?

    Answer: It is the elliptical area around the line of sight that must be at least 60% clear for optimal signal

    The first Fresnel zone is an elliptical volume around the direct path between antennas; obstructing more than 40% of it significantly degrades link performance.

  6. What does MIMO stand for in the context of 802.11n and later Wi-Fi standards?

    Answer: Multiple Input Multiple Output

    MIMO (Multiple Input Multiple Output) uses multiple antennas at both the transmitter and receiver to improve throughput and reliability through spatial multiplexing.

  7. An enterprise access point is described as 3x3:3 MIMO. What does this notation mean?

    Answer: 3 transmit antennas, 3 receive antennas, 3 spatial streams

    The notation TxR:S indicates transmit chains x receive chains: spatial streams, so 3x3:3 means 3 transmit, 3 receive antennas supporting 3 simultaneous spatial streams.