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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. What is the primary purpose of a PoE (Power over Ethernet) injector in a WLAN deployment?

    Answer: To deliver electrical power to an AP over the Ethernet cable

    A PoE injector adds DC power onto an Ethernet cable, allowing an access point to receive both data and power through a single cable.

  2. A sector antenna with a 120-degree horizontal beamwidth is typically used in which deployment scenario?

    Answer: Outdoor cellular-style coverage with multiple sectors

    Sector antennas with 120-degree beamwidth are deployed in groups of three (or more) to provide 360-degree outdoor coverage from a central tower or rooftop.

  3. What is antenna downtilt used for in outdoor WLAN deployments?

    Answer: To direct energy toward users below the antenna rather than toward the horizon

    Antenna downtilt angles the radiation pattern downward to focus coverage on users in the intended service area and reduce interference with distant systems.

  4. Which IEEE 802.11 standard introduced MU-MIMO technology to allow simultaneous transmission to multiple clients?

    Answer: 802.11ac Wave 2

    802.11ac Wave 2 introduced Multi-User MIMO (MU-MIMO), allowing access points to transmit to multiple clients simultaneously using spatial streams.

  5. What is the function of a WLAN controller in an enterprise network?

    Answer: To centrally manage, configure, and monitor multiple access points

    A WLAN controller provides centralized management of access points, handling configuration, roaming, security policies, and performance optimization.

  6. What does the term 'antenna diversity' refer to in WLAN systems?

    Answer: Employing multiple antennas and selecting the best signal to reduce multipath fading

    Antenna diversity uses two or more antennas and dynamically selects or combines the one(s) receiving the strongest signal to combat multipath fading.

  7. What is the maximum output power allowed by the FCC for 2.4 GHz Wi-Fi devices in the United States?

    Answer: 100 mW (20 dBm)

    The FCC limits 2.4 GHz ISM band intentional radiators to 1 Watt (30 dBm) conducted power, but with antenna gain limits the EIRP cap results in effective limits typically around 100 mW for point-to-multipoint.