CWNP CWNP Wireless LAN Certifications PW0-105 Questions & Answers

• Question 21:

  Given:

  A WLAN transmitter that emits a 200 mW signal is connected to a cable with 3 dB loss.

  If the cable is connected to an antenna with 10 dBi gain, what is the EIRP at the antenna element?

  A. 10 dBm

  B. 13 dBm

  C. 20 dBm

  D. 26 dBm

  E. 30 dBm

  Correct Answer: E

• Question 22:

  In an infrastructure Basic Service Set (BSS), how does the passive scanning process occur?

  A. Access points broadcast Beacons on all channels of each radio within the regulatory domain. Nearby client stations record information found in the Beacons for use in the association process.

  B. Client stations broadcast Probe Request frames on all supported channels in the regulatory domain. Nearby access points respond with Probe Response frames. Client stations record information in the Probe Response frames for use in the association process.

  C. Client stations broadcast Probe Request frames on the single channel for which they are programmed. Nearby access points respond on that channel with Probe Response frames. Clientstations record information found in the Probe Response frames for use in the association process.

  D. Access points broadcast Beacons on a single channel for which it is programmed. Nearby client stations listen for Beacon frames and record information found in the Beacons for use in the association process.

  Correct Answer: D

• Question 23:

  Given: XYZ Company is planning to install a new 802.11 WLAN, but wants to upgrade its wired infrastructure first to provide the best user experience possible. XYZ has hired you to perform the RF site survey. During the interview with the network manager, you are told that the new Ethernet edge switches will support VoIP phones and 802.11 access points, both using 802.3af PoE.

  After hearing this information, what immediate concerns do you note?

  A. VoIP phones and 802.11 access points should not be powered by the same edge switch due to distortion.

  B. The edge Ethernet switches will need to support 802.3at PoE in order to support both access points and VoIP phones.

  C. If the switches are in optimal locations for VoIP phones, they are likely to be suboptimal locations for

  802.11 APs.

  D. The power budget in the edge switches must be carefully planned and monitored based on the number of supported PoE devices.

  Correct Answer: D

• Question 24:

  Given: As a station moves away from the access point to which it is associated, it changes its data rate from 54 Mbps to 48 Mbps and then to 36 Mbps.

  What IEEE 802.11 term is used to describe this functionality?

  A. Dynamic Rate Switching

  B. Multirate Control

  C. Modulation and Coding Selection

  D. Rate Set Selectivity

  E. Adaptive Rate Management

  Correct Answer: A

• Question 25:

  If an 802.11 RF transmission reaches a receiving antenna simultaneously by direct and indirect (reflected) paths, what effect will the reflected signal have on the signal that took the direct line-of- sight path?

  A. The direct signal will only be received if the reflected signal is more than 180 degrees out of phase.

  B. The direct signal cannot be received if the indirect signal is less than 90 degrees out-of-phase.

  C. The signals will be distorted if the indirect signal arrives simultaneously at the receiver, but 90 degrees out-of-phase.

  D. If the signals are in-phase, they will combine together, cancel one another out, and create a null.

  Correct Answer: C

• Question 26:

  Given: You have been sent as a consultant to a customer site that is experiencing problems with some 2.4 GHz clients on their 802.11a/g network. After collecting information from the company about the problem, your initial troubleshooting step is to find a client device experiencing performance problems and observe its

  802.11 frame exchanges in a protocol analyzer. The retransmission rate for that client is 65% instead of the company's baseline, which is 9%.

  Based on this information, what troubleshooting step should follow to isolate the problem?

  A. Check the frame decodes in the protocol analyzer and look for an excessive number of deauthentication frames.

  B. Evaluate the client's operating frequency band with a spectrum analyzer, looking for a high noise floor or interference sources.

  C. Utilize a laptop-based site survey and planning tool to create a predictive model of the optimal AP placement in the customer's facility.

  D. With a protocol analyzer, identify the client's roaming threshold settings and reassociation behavior.

  E. Install Wi-Fi endpoint security and reporting software on the client device to monitor and log the retransmission behavior.

  Correct Answer: B

• Question 27:

  Which answer correctly completes the following sentence? The WMM certification, created by the Wi-Fi Alliance, is based on the ___________ coordination function with support for ___________ QoS priority.

  A. Hybrid, contention-based

  B. Point, scheduled

  C. Dynamic, distributed

  D. Distributed, trigger-and-delivery

  E. Enhanced, contention-free

  Correct Answer: A

• Question 28:

  What is a common feature of an 802.11 WLAN client utility? (Choose two)

  A. Real-time retry monitor

  B. AP Signal strength meter

  C. Spectrum analyzer utility

  D. VLAN configuration

  E. Link statistics display

  Correct Answer: BE

• Question 29:

  What item is essential for performing a manual RF site survey for a warehouse facility?

  A. A facility map with an explanation of applications used in each area

  B. I-Beam mounting kits for hanging temporary access points

  C. High-gain omni antennas for APs mounted high on warehouse ceilings

  D. Predictive site survey software that supports directional antennas

  E. NEMA enclosures that protect APs used for the survey

  Correct Answer: A

• Question 30:

  Which antenna types are commonly used by indoor Wi-Fi devices in a MIMO diversity implementation? (Choose two)

  A. Dipole

  B. Patch

  C. Dish

  D. Grid

  E. Sector

  Correct Answer: AB