Practice Test Geeks(CWT) Certified Wireless Technician Practice Test
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Wireless Standards & Radio Frequency Fundamentals Flashcards

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

Read the first 7 Wireless Standards & Radio Frequency Fundamentals flashcards as text

  1. The 6 GHz band introduced with Wi-Fi 6E provides approximately how much additional spectrum in the US?

    Answer: 1.2 GHz

    The FCC opened 1,200 MHz of spectrum in the 6 GHz band (5.925–7.125 GHz) for unlicensed Wi-Fi 6E use in the United States.

  2. What does RSSI measure in a Wi-Fi network?

    Answer: The relative received signal strength at a wireless device

    RSSI (Received Signal Strength Indicator) is a relative measure of the power level of a received radio signal, typically expressed as a negative dBm value.

  3. Which technology allows a single AP to serve multiple clients simultaneously by directing beams to individual users?

    Answer: MU-MIMO

    Multi-User MIMO (MU-MIMO) enables an AP to use multiple antennas to transmit to several clients at the same time, increasing overall throughput.

  4. What is the primary advantage of using a directional antenna over an omnidirectional antenna in a point-to-point wireless link?

    Answer: Increased gain and focused signal toward the remote end

    Directional antennas concentrate RF energy in a specific direction, providing higher gain and longer link distances compared to omnidirectional antennas.

  5. What is the Friis transmission equation used to calculate?

    Answer: The received signal power given transmit power, antenna gains, and distance

    The Friis transmission equation calculates the power received by an antenna given the transmitted power, antenna gains, wavelength, and separation distance.

  6. Which 802.11 feature uses the physical carrier sense mechanism and a network allocation vector (NAV) to avoid collisions?

    Answer: CSMA/CA

    CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) uses both physical sensing and a virtual NAV timer to reduce the probability of collisions in wireless networks.

  7. What does 'noise floor' refer to in RF engineering?

    Answer: The cumulative level of unwanted background RF energy in a given frequency band

    The noise floor is the aggregate level of thermal and environmental RF noise present in a spectrum band, and a signal must rise above it by a sufficient SNR margin to be decoded.