Certified Wireless Design Professional (CWDP) (PW0-250) Free Practice Test

Question 1

Given: Assume that music on hold (MOH) features are unicast only.
What VoWiFi implementations require multicast packet delivery support by the WLAN infrastructure?

A. All VoWiFi implementations

B. FMC phones

C. VoWiFi soft phones

D. Push-to-Talk VoWiFi phones

E. Flat (non-VLAN) VoWiFi implementations

Correct Answer: D

Question 2

What is a radome?

A. The unwanted signal coverage provided by either side or back lobes in directional antennas.

B. A piece of metal positioned behind APs mounted on outdoor poles, designed to limit the butterfly effect.

C. A weatherproof piece of plastic covering an antenna or antenna system.

D. The unit used to measure the signal reflected backward by the end of a cable.

E. A type of semi-circular ceiling found in atriums and that is a heavy cause of RF reflection.

Correct Answer: C

Question 3

The exhibit illustrates the azimuth and elevation for what type of antenna?

A. 20 degree vertical yagi

B. 10 degree vertical grid

C. Omni-directional

D. 60 degree horizontal patch

E. 120 degree horizontal sector

Correct Answer: E

Question 4

You are on site, planning a network at a freight shipping company on a busy harbor. Since the preliminary WLAN design specifies support for the 5 GHz spectrum, you would like to test for radar pulses to determine if DFS channels should be supported at this facility. As a part of your spectral survey with a laptop-based analyzer, you include DFS testing to identify the presence of radar. This is done by manually observing Real-time FFT, Duty Cycle, and Active Devices charts of the spectrum analyzer software.
What potential drawback is present with this DFS test method? (Choose 3)

A. Some sources of 5 GHz radar, such as military ships, are mobile in nature. A longer, automated test setup should be used to identify the presence or absence of radar.

B. Modern spectrum analyzer adapters do not provide the necessary bandwidth resolution required to detect and measure radar signatures.

C. Manual identification of radar pulses using spectrum analysis charts can be very difficult due to radar's low amplitude at the Wi-Fi receiver.

D. Many WLAN products that support DFS channels report several false positives. Ideally, the actual WLAN equipment used in the deployment should be used to test for DFS.

Correct Answer: A,C,D

Question 5

Given: As the wireless network administrator for XYZ Company, you are planning to upgrade your aging wireless network infrastructure, as well as some clients, to support 802.11n. In your research, you have discovered that your new wireless client devices and infrastructure are 802.11n, WMM, and WMM-PS certified by the Wi-Fi Alliance. Some of your existing client devices are 802.11a/b/g devices that do not support WMM.
Given this information, what scenario is possible when your company's employees begin using both types of client devices on the new WLAN?

A. The WLAN infrastructure will set the dozing times of the WMM-PS certified client devices based upon their WMM access category, while the non-WMM-PS client devices will continue to use PS-Poll frames.

B. When all STAs are using Power Save features, WMM-PS STAs will experience poor performance due to PS protection mechanisms.

C. All WMM-PS certified client devices will be prevented from utilizing WMM-PS features until all stations in use on the wireless medium are WMM-PS certified.

D. WMM-PS enabled APs will allow both WMM-PS and non-WMM-PS stations to use the trigger-and-delivery mechanism, but WMM-PS stations will get priority.

E. Performance and battery life will be inconsistent between WMM-PS and non-WMM-PS client devices when used with applications that support WMM-PS.

Correct Answer: E

Question 6

What type of pattern matches the 12 dBi antenna displayed in the exhibit?

A. Figure 3

B. Figure 1

C. Figure 2

D. Figure 4

Correct Answer: B

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CWNP Certified Wireless Design Professional (CWDP) (PW0-250) Free Practice Test