CWNA-109 practice questions 21–30

1. Question 21 · 119 in bank

   What feature of 802.11ax (HE) may impact design decisions related to AP placement and the spacing between same-channel BSS cells (BSAs) because it is designed to reduce overlapping BSS contention?

   • A6 GHz band support
   • BUplink MU-MIMO
   • CBSS Color
   • DTWT

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   Answer: C

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2. Question 22 · 119 in bank

   You are reporting on the RF environment in your facility. The manager asks you to describe the noise floor noted in the report. Which of the following is the best explanation?

   • AThe extra energy radiated by access points and client devices beyond that intended for the signal.
   • BThe noise caused by elevators, microwave ovens, and video transmitters.
   • CThe energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.
   • DThe RF energy that exists in the environment from intentional and unintentional RF radiators that forms the baseline above which the intentional signal of your WLAN must exist.

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   Answer: D

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3. Question 23 · 119 in bank

   An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain. What is the power level at the Intentional Radiator?

   • A500 mw
   • B250 mw
   • C25 mw
   • D1000 mw

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   Answer: C

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4. Question 24 · 119 in bank

   The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The users indicate that they need more throughput and all stations are 5 GHz capable 802.11ac clients that support only required features of the 802.11ac amendment. The current AP configuration uses 20 MHz channels in both 2.4 GHz and 5 GHz. What is the least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended?

   • AInstall a second AP in the coverage area
   • BUse a 40 MHz channel on the 5 GHz radio
   • CUse a 40 MHz channel on the 2.4 GHz radio
   • DUse a 160 MHz channel on the 5 GHz radio

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   Answer: B

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5. Question 25 · 119 in bank

   Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere with each other when they transmit frames. Assuming no additional APs are in the vicinity, is CCI (also called CCC) still a possibility in this network and why?

   • ANo, because the APs are far enough apart that no CCI will occur
   • BYes, because the client devices connected to one of the channel 1 APs may transmit frames that reach the other channel 1 AP as well as reaching clients connected to both channel 1 APs
   • CYes, because channel 11 loops around and causes CCI with channel 1
   • DNo, because CCI only occurs in the 5 GHz and 6 GHz frequency bands

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   Answer: B

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6. Question 26 · 119 in bank

   You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you document your findings, what term, according to common industry usage, do you use to describe the problem in this configuration?

   • ACCI
   • BACI
   • CNon-Wi-Fi interference
   • DCCC

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   Answer: B

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7. Question 27 · 119 in bank

   You are deploying a WLAN monitoring solution that utilizes distributed sensor devices. Where should sensors be deployed for best results? (Choose the best answer.)

   • AAbove the plenum on each floor
   • BIn switching closets
   • CEvery 5 meters and alongside each AP
   • DIn critical areas where WLAN performance must be high

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   Answer: D

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8. Question 28 · 119 in bank

   You are evaluating access points for use in the 5 GHz frequency band. What PHY, among those listes, supports this band and supports 80 MHz channels?

   • AERP
   • BVHT
   • COFDM
   • DHT

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   Answer: B

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9. Question 29 · 119 in bank

   What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?

   • AGrid antennas at each endpoint
   • BMinimum output power level of 2 watts
   • CA minimum antenna gain of 11 dBi at both endpoints
   • DA Fresnel Zone that is at least 60% clear of obstructions

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   Answer: D

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10. Question 30 · 119 in bank

    What statement about 802.11 WLAN performance is true?

    • AIn modern networks, both centralized and distributed data forwarding work well for most standard office deployments
    • BEnterprise WLANs perform better as more wireless clients connect with each AP
    • CIn most WLANs, no special skill or tuning is required to get peak performance
    • DTo get the best performance out of an AP, you should enable all data rates in all scenarios

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    Answer: A

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CWNA-109 practice, question 21. 119 questions available.