CWNP CWNA CWNA-106 Questions & Answers

• Question 41:

  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. Low-gain omni antennas for APsmounted high on warehouse ceilings

  D. Predictive site survey software that supports highly directional antennas

  Correct Answer: A

• Question 42:

  ABC Company has a 2.4 and 5 GHz WLAN deployment. DFS functionality is enabled as required by the regulatory domain andAPs use DFS channels as long as radar is not detected. Band steering is also enabled to encourage dual-band clients to use frequency bands with more capacity.

  Your performance analysis shows that many dual-band VoWiFi client devices will move back and forth between 2.4 and 5 GHz as the users roam throughout the building. All APs have 2.4 and 5 GHz radios enabled with transmit power adjusted to accommodate relatively similar cell sizes.

  This "band hopping" behavior is viewed by network staff to be undesirable. What is the most likely cause of the unpredictable client band selection behavior?

  A. Interference from 5 GHz radar sources has increased frame corruption and retries on channels 36-48.

  B. 5 GHz frequencies offer better RF penetration than 2.4 GHz, but2.4 GHz offers more voice call capacity and lower latency than 5 GHz.

  C. The voice client does not support DFS, and therefore experiences some 5 GHz coverage holesas it moves through the network.

  D. The client's band selection algorithm prefers 5 GHz, butband steering behavior usually steers 75-85% of client devices to 2.4 GHz.

  Correct Answer: C

• Question 43:

  What term correctly completes the following sentence?

  In an 802.11 frame, the IP packet is considered by the MAC layer to be a(n) _________.

  A. MAC Service Data Unit(MSDU)

  B. MAC Protocol Data Unit (MPDU)

  C. PLCP Service Data Unit (PSDU)

  D. PLCP Protocol Data Unit (PPDU)

  Correct Answer: A

• Question 44:

  What problems may exist for a multiple channel architecture (MCA) WLAN when its APs are all operating at full power (typically 100mW)? (Choose 2)

  A. Wi-Fi enabled voice handsets with low transmit power can experience asynchronous downlink and uplink performance.

  B. WLAN client stations can experience the hidden node problem when located near each other within the same cell.

  C. The mismatched power between WLAN client stations and APs violates regulatory and IEEE signal quality requirements.

  D. Cell size may be too large, causing co-channel interference to adjacent cells and reducing system capacity.

  E. APs operating in the 2.4 GHz band wouldprevent microwave ovens and analog video cameras from functioning.

  Correct Answer: AD

• Question 45:

  What component of the 802.11 standard allows stations to reserve access to the RF medium for a specified period of time?

  A. Short guard intervals

  B. DTIMInterval

  C. Listen Interval

  D. Probe Request frames

  E. RTS or CTS frames

  Correct Answer: E

• Question 46:

  In WLAN security, which authentication method always create Layer 2 dynamic encryption keys?

  A. HTTPS Captive Portal

  B. WEP

  C. EAP-TLS

  D. Shared Key

  Correct Answer: C

• Question 47:

  What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries? (Choose 2)

  A. Data frames too large for the physical environment

  B. Client stationsbroadcasting with too much power

  C. Access points broadcasting with too little power

  D. Client stations too close in proximity to each other

  E. Obstacles between client stations causing attenuation

  F. Large 802.11 cells with physically distributed stations

  Correct Answer: EF

• Question 48:

  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/n/ac network. After collecting informationfrom 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 thecompany's baseline, which is 9%.

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

  A. Check theframe 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 49:

  You were previously onsite at XYZ's facility to conduct a pre-deployment RF site survey. The WLAN has been deployed according to your recommendations and you are onsite again to perform a post-deployment validation survey.

  When performing this type of post-deployment RF site survey for VoWiFi, what are two steps that must be performed? (Choose 2)

  A. Coverage analysis to verifyappropriate coverage and roamingboundaries

  B. Spectrum analysis to locate and identify RF interference sources

  C. Frequency-band hopping analysis to detect improper RF channel implementations

  D. Protocol analysis to discover channel use on neighboring APs

  E. Application analysis with anactive phone call on a VoWiFi handset

  Correct Answer: AE

• Question 50:

  What are two channel modes specified by the 802.11n (High Throughput) PHY? (Choose 2)

  A. 20 MHz

  B. 20/40 MHz

  C. 40/80 MHz

  D. 22 MHz

  E. 80 MHz

  F. 160 MHz

  Correct Answer: AB