CWNA-109 practice questions 61–70

1. Question 61 · 119 in bank

   An RF signal sometimes bends as it passes through a material rather than around an obstacle. What is the RF behavior that this statement best describes?

   • AScattering
   • BReflection
   • CDiffraction
   • DRefraction

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   Answer: D

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2. Question 62 · 119 in bank

   What can cause excessive VSWR in RF cables used to connect a radio to an antenna?

   • AHigh gain parabolic dish antenna
   • BHigh gain yagi antenna
   • CImpedance mismatch
   • DRadio output power above 100 mW but below 400 mW

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   Answer: C

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3. Question 63 · 119 in bank

   What factor does not influence the distance at which an RF signal can be effectively received?

   • AThe receiving station’s radio sensitivity
   • BThe receiving station’s output power
   • CFree Space Path Loss
   • DThe transmitting station’s output power

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   Answer: B

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4. Question 64 · 119 in bank

   A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. If the cable is connected to an antenna with 9 dBi gain, what is the EIRP at the antenna element?

   • A23 dBm
   • B26 dBm
   • C13 dBm
   • D10 dBm

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   Answer: A

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5. Question 65 · 119 in bank

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

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

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   Answer: A

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6. Question 66 · 119 in bank

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

   • APassive Gain
   • BBeam Digression
   • CActive Amplification
   • DDirected Radiation

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   Answer: A

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7. Question 67 · 119 in bank

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

   • AGrid and sector
   • BDish and grid
   • CDipole and yagi
   • DPatch and panel

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   Answer: D

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8. Question 68 · 119 in bank

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

   • AVertical beamwidth is displayed (in degrees) on the antenna’s Azimuth chart.
   • BHorizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by 3 dB.
   • CThe beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
   • DWhen antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions

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   Answer: B

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9. Question 69 · 119 in bank

   What best describes WPA2 in relation to 802.11 wireless networks?

   • AWPA2 is the second version of WPA and it enhances security through the use of TKIP instead of WEP.
   • BWPA2 is the IEEE standard that defines security for WLANs.
   • CWPA2 is a certification created by the Wi-Fi Alliance that validates devices correctly implement CCMP/AES.
   • DWPA2 is specified in the 802.11 standard as implementing CCMP/AES.

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   Answer: C

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10. Question 70 · 119 in bank

    An IEEE 802.11 amendment is in the draft state. What impact does this draft amendment have on the 802.11 standard?

    • ADevices will be released based on the draft amendment and the draft amendment features are part of the standard.
    • BNo impact: Until an amendment is ratified, it does not become part of the standard.
    • CThe standard is changed to reflect the new capabilities as soon as an amendment enters the draft stage
    • DNo impact: Draft amendments do not become part of the standard until a working group is formed.

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    Answer: B

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CWNA-109 practice, question 61. 119 questions available.