CWNP CWNP Certifications CWDP-304 Questions & Answers

• Question 121:

  During a validation site survey, you realize that the installers mounted some of the APs above the ceiling. They said that this was a request from the building architect due to aesthetics constraints. During the requirements gathering, you weren't advised about any aesthetics constraints from the main stakeholder of the project. What should you do in this case?

  A. Advise the stakeholder that WLAN performance requirements will not be met and a new design process will be needed to meet the requirements.

  B. Leave it as it is and allow automatic channel management to correct any issues.

  C. Increase the output power on all APs by 6 dB immediately.

  D. Remove all external antennas and use only the internal antennas to reduce multipath.

  Correct Answer: A

• Question 122:

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

  A. AF31

  B. CS3

  C. VO

  D. EF

  Correct Answer: D

• Question 123:

  Which definition correctly describes the "local MAC" variation of the centralized WLAN architecture?

  A. All MAC functions are performed by the AP. A minimal subset of network control is offloaded to the WLAN controller along with management and monitoring functions.

  B. PHY functions are performed directly by the AP. MAC functions are divided almost equally between the WLAN controller and the AP, according to the time sensitivity of the feature or service.

  C. The AP provides the RF termination point for the WLAN, but performs very few of the WLAN functions or services. The WLAN controller performs all MAC functions and the AP is very simple and lightweight.

  D. All RF-, data-, and control-related WLAN functions are performed by the AP. APs coordinate network services with one another and are managed by a WNMS,

  Correct Answer: A

• Question 124:

  When using a predictive design tool, you have selected APs with an antenna gain 3 dBi and set the transmit power of the predicted APs to 25 mW. What should be EIRP of the APs in the design?

  A. 11 dBm

  B. 6.25 mW

  C. 125 mW

  D. 17 dBm

  Correct Answer: D

• Question 125:

  In a manufacturing facility with highly reflective materials, you are planning an upgrade to your existing 802.11b WLAN implementation. 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 enhancement typically should NOT be enabled on the 2.4 GHz radio of the new APs?

  A. Multiple streams

  B. Short guard intervals

  C. Block Acknowledgments

  D. Frame aggregation

  Correct Answer: B

• Question 126:

  In your company's WLAN, you expect to have a mixed client PHY environment and plan to use protection mechanisms. The protection mechanism used by your client devices is configurable.

  What is the best protection mechanism for backward compatibility of 802.11n devices with 802.11b devices?

  Response:

  A. WMM Protection

  B. SMPS

  C. CTS-to-Self

  D. Dual-CTS

  E. RTS/CTS

  Correct Answer: E

  RTS/CTS is the best protection mechanism for backward compatibility of 802.11n devices with 802.11b devices because it prevents collisions and interference between different modulation types. 802.11n devices use OFDM, while 802.11b devices use DSSS. These two modulation types are not compatible with each other, but they can coexist in the same environment if they use protection mechanisms to avoid overlapping transmissions. RTS/CTS is a protection mechanism that requires a station to send a Request to Send (RTS) frame before transmitting data, and wait for a Clear to Send (CTS) frame from the receiver or the access point. The RTS and CTS frames are sent at a clause 15 (DSSS) or clause 18 (HR/DSSS) rate, which can be understood by both 802.11n and 802.11b devices. The RTS and CTS frames also contain a duration field that indicates how long the data transmission will last. This way, other stations can defer their transmissions until the channel is clear. RTS/CTS reduces the chances of collisions and hidden node problems, and improves the performance and reliability of the wireless network. References: CWNP, CWDP Certified Wireless Design Professional Official Study Guide, How 802.11n backward compatibility works

• Question 127:

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

  A. 4 (primary), +1 (secondary)

  B. 2 (primary), -1 (secondary)

  C. 8 (primary), +1 (secondary)

  D. 1 (primary), 6 (secondary)

  Correct Answer: A

• Question 128:

  When analyzing published competitive tests by equipment vendors, what items are the tests usually lacking?(Choose all that apply.) Response:

  A. Client devices and configurations

  B. Audit by a third party

  C. Detailed test methodology

  D. Detailed configurations of each vendor's equipment

  Correct Answer: ACD

• Question 129:

  What roaming technology uses stored keys at the APs for roam back if a client STA returns after having roamed away? Response:

  A. SCA roaming

  B. Preauthentication

  C. OKC

  D. PMK caching

  Correct Answer: D

• Question 130:

  When implementing WLAN security according to common best practices, what feature should be enabled when configuring an EAP type?

  A. The "Use WEP if RADIUS server unavailable" option

  B. The "Validate server certificate" option

  C. The "Trusted Root Certification Authorities" list

  D. The "Do not prompt user to authorize new servers or trusted certification authorities" option

  Correct Answer: B