CWNP PW0-250 問題集

質問 1：
A Layer 1 sweep was performed at a customer location, and you are asked to review a capture taken during the survey.

What is the meaning of the chart shown in the exhibit and how should it be interpreted?
A. Real Time FFT means Real Time Fast Frequency Timing and shows the RF pulses measured by the Layer 1 sweep tool.
B. Real Time FFT means Real Time Frequency Fundamental Texture and shows the value of the noise background generated by the card used to perform the Layer 1 sweep.
C. Real Time FFT means Real Time Fast Fourier Transform and shows the max value of the signal detected on each frequency in real time.
D. Real Time FFT means Real Time First Fundamental Trace and shows the value of the first signal detected on each frequency at each sweep interval.
正解：C

質問 2：
You told your customer that multipath fading may be mitigated simply by moving one or both of the receiver's antennas a little bit, usually by one to four wavelengths away from its original position. Your customer is prepared to make the change, but does not know the wavelength for 802.11a.
What is the approximate wavelength of an 802.11a radio wave?
A. 58 cm (22.83 inches)
B. 15.24 cm (6 inches)
C. 12 cm (4.72 inches)
D. 45 cm (17.71 inches)
E. 5.5 cm (2.16 inches)
正解：E

質問 3：
When performing an indoor predictive site survey to make the WLAN planning and design
cycle more efficient, what is a best practice for configuration of the simulated APs in the predictive modeling software?
A. If dynamic RRM will be used, AP transmit power should be set to an estimated average level of the expected client devices, such as 25 mW.
B. All simulated APs should be set to 20 MHz channels only.
C. Always use the default 2.2 dBi omnidirectional antenna patterns for simulated APs.
D. Defining custom AP and antenna patterns will yield more accurate prediction data than the pre-configured vendor AP/antenna combinations.
正解：A

質問 4：
Why does a frame transmitted at 1 Mbps have a greater usable range than the same frame transmitted at 54 Mbps?
A. To improve reliability, 802.11 STAs increase transmit power as the signaling rate decreases.
B. Free space path loss causes greater signal dispersion for higher rate transmissions.
C. Frames sent at higher data rates are also sent at higher power levels and are therefore more prone to collisions and multipath.
D. Lower data rate RF transmissions travel at higher speeds and are less likely to experience collisions.
E. Receiver sensitivity requirements are lower for frames transmitted with less complex modulation and coding.
正解：E

質問 5：
Your customer location is equipped with DAS, originally deployed to relay a GSM signal indoors and provide 802.11 data coverage to static stations. What type of wireless application would be least likely to be supported by this RF distribution model?
A. FTP over implicit TLS/SSL
B. On-demand video streaming over wireless
C. VoWLAN if the codec is G.729.
D. Data connection with frequent roaming
E. Location-based services for wireless assets or RFID tags
正解：E

質問 6：
What are some advantages of designing guest access as it is shown in the exhibit?

A. Allows a single SSID with different authentication/encryption models to be used for all WLAN services for corporate users and guests
B. Minimizes configuration requirements for segmentation and filtering of guest traffic across internal LAN
C. Allows simple and secure guest collaboration (file/print sharing) with corporate users
D. Enhances performance of web proxy servers in the DMZ for guest Internet traffic
E. The border firewall configuration will not require any additional rules to pass guest traffic to the DMZ controller
正解：B