CWNP PW0-250 問題集

質問 1：
What type of pattern matches the 12 dBi antenna displayed in the exhibit?

A. Figure 2
B. Figure 3
C. Figure 4
D. Figure 1
正解：D

質問 2：
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 3：
You are working on a VoWLAN design with your customer's wired networking team. How many distinct priority levels do you expect for the voice applications?
A. 1 priority level per client and AP pair, so the total number depends on the expected number of clients
B. 1 priority level, but 2 queues (one for uplink traffic, one for downlink traffic)
C. 1 priority level for voice RTP, 1 priority level for voice control and RTCP
D. 1 priority level for VoWLAN client traffic, 1 priority level for wired VoIP client traffic
正解：C

質問 4：
Multicast video applications typically require special treatment on the Wi-Fi network due to the nature of multicast traffic. Many vendors implement proprietary multicast-to-unicast conversion for this reason.
Which of the following is NOT a valid reason for special unicast conversion of downlink multicast traffic?
A. Group addressed downlink frames are not acknowledged on the wireless medium.
B. Multicast traffic must always be transmitted via omnidirectional antennas.
C. In QoS WLANs, multicast traffic is always assigned to the best effort (AC_BE) transmit queue.
D. Frames with a group receiver address must always be sent at a rate in the Basic Rate Set.
正解：B

質問 5：
While configuring your site survey software for an upcoming manual survey project, you notice the configuration option for "Network Card Simu-lation" as shown in the exhibit.

What is the purpose of this feature and when would you use it?
A. The site survey software manufacturer allows you to view the collected RF data as if it were collected by a different type of adapter. This functionality allows you to review survey data to determine how the RF environment will likely look based on the receive sensitivity and other RF capabilities of a specific client adapter.
B. Since WLAN adapters are not typically calibrated by manufacturers, this setting is a form of software calibration in which you can calibrate an (uncalibrated) adapter to match one of thecalibrated adapters shown in the list. This process improves the reliability of RF data collection and reporting when uncalibrated adapters are used.
C. This is the configuration area in which you specify the adapter type that will be used for the site survey so that the survey software can interpret that adapter's reported metrics (based on proprietary formulas) into an RF measurement that is standardized by the survey software and known to its users. This is done for every survey.
D. This setting allows the site survey software to convert the AP's measured downlink RF
data into a simulated data set as if the same data were transmitted by a specific client station. It is useful for determining uplink client performance when clients are located far from APs as well as projecting cell size for ad hoc networks.
正解：A

質問 6：
To achieve a 450 Mbps MCS, what 802.11n features (from the numbered list below) are required?
1.Frame aggregation
2.Short GI
3.40 MHz channels
4.2 spatial streams
5.3 spatial streams
6.Transmit beamforming (TxBF)
A. 2, 3, 5
B. 2, 3, 4
C. 1, 2, 3, 5
D. 1, 2, 3, 5, 6
E. 1, 2, 3, 4, 6
F. 1, 2, 3, 4
正解：A