Free CWNA-108 Exam Braindumps (page: 2)

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In a long-distance RF link, what statement about Fade Margin is true?

  1. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.
  2. The Fade Margin is a measurement of signal loss through free space and is a function of frequency and distance.
  3. Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.
  4. The Fade Margin of a long-distance radio link should be equivalent to the receiver’s low noise filter gain.

Answer(s): C

What wireless networking term describes the increase of RF energy in an intentional direction with the use of an antenna?

  1. Directed Radiation
  2. Beam Digression
  3. Passive Gain
  4. Active Amplification

Answer(s): C

Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?

  1. Dipole and yagi
  2. Grid and sector
  3. Patch and panel
  4. Dish and grid

Answer(s): C

What statement about the beamwidth of an RF antenna is true?

  1. Horizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by 3 dB.
  2. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
  3. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.
  4. Vertical beamwidth is displayed (in degrees) on the antenna’s Azimuth chart.

Answer(s): A

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