CWNP CWDP Certifications PW0-250 Questions & Answers

• Question 1:

  What is the DSCP Per Hop Behavior equivalent classification of the 802.11e AC_VO priority level?

  A. AF31

  B. EF

  C. VO

  D. AF12

  E. CS3

  Correct Answer: B

• Question 2:

  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 PHY parameter set field

  C. The minimum transmit data rate value

  D. The CTS-to-self threshold

  E. The Beacon interval

  F. The acknowledgement timeout threshold

  Correct Answer: F

• Question 3:

  In a centralized WLAN architecture, what new problem may arise when you change the data forwarding model from centralized to distributed? (Choose 2)

  A. APs that were designed for a centralized forwarding model may not support all features in distributed forwarding mode.

  B. Centralized control functions, such as key management and distribution, RRM, and load balancing will no longer be supported.

  C. All RRM controls will also need to be distributed to a master AP that acts as a channel and transmit power arbiter for other APs in the ESS.

  D. The Ethernet switch ports to which APs are connected may need to be reconfigured to support VLAN tagging and QoS at the network edge.

  E. APs will not have the processing capabilities to support AES-CCMP, so TKIP will be the recommended encryption method.

  Correct Answer: AD

• Question 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. Multicast traffic must always be transmitted via omnidirectional antennas.

  B. Group addressed downlink frames are not acknowledged on the wireless medium.

  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.

  Correct Answer: A

• Question 5:

  As you plan a WLAN upgrade, you have assessed the network requirements and data signatures of your applications. One of the popular applications used on your network requires high bandwidth and low to medium Wi-Fi loss, but can tolerate moderate latency and jitter.

  What application matches this description?

  A. FTP

  B. Email

  C. Skype chat

  D. Voice

  E. Video conferencing

  F. Video-on-demand

  Correct Answer: F

• Question 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. The border firewall configuration will not require any additional rules to pass guest traffic to the DMZ controller

  D. Enhances performance of web proxy servers in the DMZ for guest Internet traffic

  E. Allows simple and secure guest collaboration (file/print sharing) with corporate users

  Correct Answer: B

• Question 7:

  In this question, you will compare the mobility processes of a network that supports WPA2- Personal and WPA2-Enterprise. Assume the use of a 15-character ASCII passphrase for WPA2- Personal and EAP-TTLS/MSCHAPv2 with WPA2Enterprise. Also, assume that proprietary roaming protocols are not supported.

  When a device transitions from one BSS to another within the same ESS, what steps must be performed in the WPA2-Enterprise transition that are not performed in the WPA2-Personal transition? (Choose 2)

  A. Open System Authentication

  B. 802.11 Reassociation

  C. 802.1X authentication

  D. 4-Way Handshake

  E. Transfer of PMK from AAA server to authenticator

  F. Conversion of passphrase to PMK

  Correct Answer: CE

• Question 8:

  ABC Manufacturing has a heavily-used dual-band (2.4 / 5 GHz) WLAN, but sporadic RF interference across the 2.4 GHz band is causing dropped VoWiFi calls and leading to data connectivity and throughput problems.

  

  What steps should ABC Manufacturing take to most effectively remedy this problem?

  A. Solution 1

  B. Solution 2

  C. Solution 3

  D. Solution 4

  Correct Answer: B

• Question 9:

  You captured the wireless frame shown in the exhibit during a post-deployment verification site survey.

  

  What can you tell the customer about this network?

  A. This is a video stream packet, and there is a QoS marking issue on the wired side, because the DSCP value should not be set to 0.

  B. This is a voice control packet, and the configuration looks normal, as voice control may or may not have a DSCP tag.

  C. This is a video stream packet, and the configuration looks normal, as DSCP is always set to 0 when 802.11e QoS is specified at Layer 2.

  D. This is a voice RTP packet, and its marking was downgraded from Voice to Video which is a sign of congestion issues.

  Correct Answer: B

• Question 10:

  During a post-deployment verification, you are requested to troubleshoot an area where users are experiencing poor throughput. They are using data communication only, mainly from laptops. You captured the frame displayed in the exhibit from the location where problems are reported. This frame is typical of those that were captured by the analyzer.

  

  What does this frame reveal about the RF network in this area?

  A. One station seems to be streaming video, thus may have reserved significant bandwidth via admission control

  B. Contention Free is in place in this network, which may starve some non-QoS stations from access

  C. Multipath or excessive collisions seem to be an issue in this area

  D. The AP seems to be too far to provide enough coverage to this area

  E. Stations are using null data frames as protection mechanisms to reserve the medium

  F. The station that sent this frame is causing a DoS attack by using extended Duration values

  Correct Answer: C