CWNP CWNP Certifications CWNA-107 Questions & Answers

• Question 51:

  An RF sigma sometimes bends as it passes through some material other than free space. What is the term that describes this behavior?

  A. Reflection

  B. Refraction

  C. Scattering

  D. Warping

  Correct Answer: B

• Question 52:

  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 other APs are in the vicinity, is CCI still a possibility in this network and why?

  A. Yes, because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as clients connected to the other channel 1 AP.

  B. No, because the APs are far enough apart that no CCI will occur.

  C. No, because CCI only occurs in the 5 GHz frequency band.

  D. Yes, because channel 11 loops around and causes CCI with channel 1.

  Correct Answer: A

• Question 53:

  When considering data rates available in HT and VHT PHY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?

  A. The frequency band in use

  B. The client drives

  C. The guard interval D. The height of the antennas

  Correct Answer: C

  Reference https://arxiv.org/pdf/1702.03257.pdf

• Question 54:

  You are planning for PoE in a standard office deployment. Which one of these devices is least likely to be a PoE PD?

  A. Video camera

  B. Access point

  C. VoIP phone

  D. Ethernet switch

  Correct Answer: A

• Question 55:

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

  A. The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.

  B. The noise caused by elevators, microwave ovens, and video transmitters.

  C. The 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.

  D. The extra energy radiated by access points and client devices beyond that intended for the signal.

  Correct Answer: C

  Reference

  http://blog.prosig.com/2008/04/14/what-is-db-noise-floor-dynamic-range/

• Question 56:

  You are deploying a WLAN with the access points configured for 10 mW of output power on the 2.4 GHz radios and 20mW of output power on the 5GHz radios. Some semi-directional antennas are also in use. What kind of deployment is described?

  A. High density

  B. SOHO

  C. Standard office

  D. Residential

  Correct Answer: A

• Question 57:

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

  A. Horizontal and vertical beamwidth are calculated at the point where the main lobe decreases power by 3 dB.

  B. Vertical beamwidth is displayed (in degrees) on the antenna's Azimuth chart.

  C. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.

  D. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.

  Correct Answer: A

• Question 58:

  What statement about 802.11 WLAN performance is true?

  A. In modern networks, both centralized and distributed data forwarding work well for most standard office deployments

  B. In most WLANs, no special skill or tuning is required to get peak performance

  C. WLANs perform better as more wireless clients connect with each AP

  D. To get the best performance out of an AP, you should disable data rates of 72 Mbps and lower

  Correct Answer: D

• Question 59:

  A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-802.11 device?

  A. Access point spectrum analyzer

  B. Laptop-based spectrum analyzer with an omni-directional antenna

  C. Laptop-based spectrum analyzer with a directional antenna.

  D. Laptop-based spectrum analyzer with an omni-directional antenna.

  Correct Answer: A

• Question 60:

  What Linux shell command can be used to view the hardware and PHY capabilities of a wireless adapter in detail including channel widths, output power setting, channels supported, and more?

  A. ifconflg

  B. iw phy

  C. netsh wlan show device

  D. iwconflg

  Correct Answer: D