CWNP CWNP Certifications CWDP-304 Questions & Answers

• Question 41:

  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?

  Response:

  A. Always use the default 2.2 dBi omnidirectional antenna patterns for simulated APs.

  B. 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.

  C. All simulated APs should be set to 20 MHz channels only.

  D. Defining custom AP and antenna patterns will yield more accurate prediction data than the pre-configured vendor AP/antenna combinations.

  Correct Answer: B

• Question 42:

  What factors are key features when designing a guest network for a large enterprise?(Choose all that apply.)

  Response:

  A. 802.11n

  B. Rate limiting

  C. 802.1X security

  D. Traffic tunneling or anchoring

  E. SSID segmentation

  Correct Answer: BD

• Question 43:

  Which operational plane would be responsible for performing automated RF management?

  Response:

  A. Integration

  B. Data

  C. Distribution

  D. Control

  E. Management

  Correct Answer: D

• Question 44:

  Excessive uplink RTP frame retransmissions can result in ____________.

  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

  Correct Answer: B

• Question 45:

  Name the audience type not addressed in this chapter for HLDs. Response:

  A. Operations

  B. Executives

  C. Designers

  D. Engineering

  Correct Answer: A

• Question 46:

  In the enterprise, when is WPA/WPA2-Personal generally a recommended solution?(Choose all that apply.) Response:

  A. When client devices do not support 802.1X/EAP

  B. When mobile device applications require high-latency roaming times between APs

  C. When client devices are provisioned in bulk and would otherwise share 802.1X credentials

  D. When the network security policy demands that each user have unique access credentials

  Correct Answer: AC

• Question 47:

  You and 10 other people are connected to a public hot-spot. You issue a ping sweep on the network, but you can't find any devices on the same subnet as yours. What feature might be enabled on the WLAN infrastructure that is preventing you from communicating with other devices on that subnet?

  A. Peer-to-peer blocking

  B. OSPF external routes

  C. Band steering

  D. Load balancing

  Correct Answer: A

• Question 48:

  Given: You are evaluating the theoretical and real-world RF gain benefits of transmit and receive features introduced by 802.11 with MIMO. This exercise allows you to quantify the features value in a real-world environment. What is the maximum theoretical signal gain of chip-based TxBF and MRC (as features) when compared to the same AP using only a single antenna for transmit and receive (effectively simulating a 1x1 chip)?

  A. 2 Rx or Tx chains = 3 dBi gain 3 Rx or Tx chains = approx 5 dBi gain 4 Rx or Tx chains = 6 dBi gain

  B. 2 Rx or Tx chains = 1 dBi gain 3 Rx or Tx chains = 2 dBi gain 4 Rx or Tx chains = 3 dBi gain

  C. 2 Rx or Tx chains = 3 dBi gain 3 Rx or Tx chains = 6 dBi gain 4 Rx or Tx chains = 9 dBi gain

  D. 2 Rx or Tx chains = approx 4-6.5 dBi gain 3 Rx or Tx chains = approx 7-10 dBi gain

  Correct Answer: D

  The maximum theoretical signal gain of chip-based TxBF and MRC depends on the number of antennas and the channel conditions. TxBF (transmit beamforming) is a technique that focuses the transmitted signal in the direction of the

  intended receiver, resulting in higher signal strength and less interference. MRC (maximum ratio combining) is a technique that combines the signals received by multiple antennas in an optimal way, resulting in higher signal-to-noise ratio and

  better performance. The theoretical gain of TxBF and MRC can be calculated as

  GTxBF=10log10(N)

  and

  GMRC=10log10(N)

  where N is the number of antennas. Therefore, the total gain of TxBF and MRC is Gtotal=GTxBF+GMRC=20log10(N)

  However, this is the ideal case and assumes perfect channel conditions and alignment. In reality, the gain is lower due to factors such as channel fading, antenna spacing, and feedback delay.According to the CWDP study guide1, the typical

  gain of TxBF and MRC is about 4-6.5 dBi for 2 antennas, 7-10 dBi for 3 antennas, and 10-13 dBi for 4 antennas.Therefore, the answer is D.References:1: CWDP Certified Wireless Design Professional Official Study Guide: Exam PW0-250,

  Chapter 8, page 267.

• Question 49:

  What method improves throughput in a low SNR environment? Response:

  A. 64-QAM

  B. A-MSDU frame aggregation

  C. Receive Diversity

  D. SM

  Correct Answer: C

• Question 50:

  A museum wants to offer Wi-Fi to its visitors. One of their requirements is to have the APs blend into the design of the museum. What should you do to meet this requirement?

  A. Use a plastic cover that could blend in with the environment

  B. Lock the AP inside of a metal box

  C. Place the APs in between walls and I-beams

  D. Use an 802.11b AP, so it looks old enough to be in a museum

  Correct Answer: A