CWNP PW0-250 Online Practice Questions and Exam Preparation

CWNP PW0-250 Online Questions & Answers

• Question 41:

  In a manufacturing facility with highly reflective materials, you are planning an upgrade to your existing 802.11b solution. You have chosen a dual-band 802.11n infrastructure product for this purpose. Your client applications include:

  Handheld scanners -- for inventory management

  Toughbooks (laptops) -- mounted on forklifts for inventory and workflow management

  VoWiFi phones -- used by select employees throughout the facility

  You are evaluating all of the 802.11n enhancements and determining which features to enable for your environment and applications.

  In this scenario, what 802.11n enhancements should NOT be enabled on the 2.4 GHz radio of the new APs? (Choose 2)

  A. 40 MHz channels
  B. Short guard intervals
  C. Block Acknowledgments
  D. Frame aggregation
  E. MRC
  F. STBC
  A. 40 MHz channels
  B. Short guard intervals

• Question 42:

  When deploying long-distance 802.11 bridge links (10 miles / 16 km), what parameter may be critical for improving data flow by reducing retries caused by the long distances?

  A. The sequence control field value
  B. The acknowledgement timeout threshold
  C. The minimum transmit data rate value
  D. The CTS-to-self threshold
  E. The Beacon interval
  F. The PHY parameter set field
  B. The acknowledgement timeout threshold

• Question 43:

  What is a radome?

  A. A type of semi-circular ceiling found in atriums and that is a heavy cause of RF reflection.
  B. A weatherproof piece of plastic covering an antenna or antenna system.
  C. The unit used to measure the signal reflected backward by the end of a cable.
  D. A piece of metal positioned behind APs mounted on outdoor poles, designed to limit the butterfly effect.
  E. The unwanted signal coverage provided by either side or back lobes in directional antennas.
  B. A weatherproof piece of plastic covering an antenna or antenna system.

• Question 44:

  Excessive uplink RTP frame retransmissions can result in . (Choose 3)

  A. Deauthentication of the transmitter by the receiver
  B. Lowering of the data transmission rate by the transmitting station
  C. MOS scores in excess of 5
  D. Head-of-Line blocking at the receiver
  E. Shortened battery life of a transmitting station
  F. Increased jitter in a VoWiFi connection
  B. Lowering of the data transmission rate by the transmitting station
  E. Shortened battery life of a transmitting station
  F. Increased jitter in a VoWiFi connection

• Question 45:

  An associated STA detects a new BSS with the same SSID as the STA's current BSS. The new BSS uses a different IP subnet than the current BSS. If the STA is configured to use 802.1X/EAP preauthentication, what is likely to occur?

  A. The STA will not attempt to preauthenticate because the new BSS uses a different IP subnet.
  B. The STA will attempt to preauthenticate, but fail because the new BSS uses a different data-link broadcast domain.
  C. The STA will attempt to preauthenticate and succeed if DHCP is supported on the new subnet.
  D. The STA will attempt to preauthenticate and succeed if IP Mobility is enabled on the AP or WLAN controller.
  E. The STA will attempt to preauthenticate and succeed if the current AP has shared its cached PMK.
  B. The STA will attempt to preauthenticate, but fail because the new BSS uses a different data-link broadcast domain.

• Question 46:

  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. 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.
  B. 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.
  C. Performance and battery life will be inconsistent between WMM-PS and non-WMM-PS client devices when used with applications that support WMM-PS.
  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. When all STAs are using Power Save features, WMM-PS STAs will experience poor performance due to PS protection mechanisms.
  C. Performance and battery life will be inconsistent between WMM-PS and non-WMM-PS client devices when used with applications that support WMM-PS.

• Question 47:

  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. 1, 2, 3, 4
  B. 1, 2, 3, 5
  C. 1, 2, 3, 4, 6
  D. 1, 2, 3, 5, 6
  E. 2, 3, 4
  F. 2, 3, 5
  F. 2, 3, 5

• Question 48:

  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.

  

  A. 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.
  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. 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.
  D. 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.

• Question 49:

  What is a valid 40 MHz channel configuration in the 2.4 GHz ISM band where channels 1-11 are permitted? (Choose 2)

  A. 4 (primary), +1 (secondary)
  B. 4 (primary), -1 (secondary)
  C. 8 (primary), +1 (secondary)
  D. 1 (primary), 6 (secondary)
  E. 11 (primary), 6 (secondary)
  F. 1 (primary), 5 (secondary)
  A. 4 (primary), +1 (secondary)
  F. 1 (primary), 5 (secondary)

• Question 50:

  At a university, the WLAN has been successfully deployed for ubiquitous access for faculty, students, and guests. Many student computer labs are available throughout the campus with wired network connectivity, but there are also a few smaller lab areas and workstations where Ethernet cabling is not available. For student wireless use, the students must authenticate against RADIUS/Active Directory using PEAP. Also, the network administrators at this university would like administrative access to these workstations when they are not in use by students so that the administrators can manage group policies, update OS patches, and perform other routine software maintenance.

  What deployment options are available and recommended for both student use and remote administration of these workstations? (Choose 2)

  A. Due to the architecture of 802.1X port-based access control, it is not possible for a wireless- only computer to access network services required by network administrators in this scenario.
  B. Machine authentication accounts should be enabled to provide persistent machine network connectivity when student users are not associated.
  C. The WLAN infrastructure vendor is responsible for providing proprietary client connectivity options to facilitate device connectivity without user interaction.
  D. These workstations should be Ethernet-connected to a wireless client bridge, which will maintain network connectivity independent of student connectivity status.
  E. These stations should be deployed with dual WLAN adapters. One adapter would be used for consistent network connectivity for administrative purposes and the second adapter should be used for student access.
  B. Machine authentication accounts should be enabled to provide persistent machine network connectivity when student users are not associated.
  D. These workstations should be Ethernet-connected to a wireless client bridge, which will maintain network connectivity independent of student connectivity status.