CWNP CWNA-109 Online Practice Questions and Exam Preparation

CWNP CWNA-109 Online Questions & Answers

• Question 121:

  Your consulting firm has recently been hired to complete a site survey for a company desiring an indoor coverage WI-AN. Your engineers use predictive design software for the task, but the company insists on a pre-design site visit.

  What task should be performed as part of the pre-design visit to prepare for a predictive design?

  A. Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls
  B. Collect information about the company's security requirements and the current configuration of their RADIUS and user database servers
  C. Test several antenna types connected to the intended APS for use in the eventual deployment
  D. Evaluate the building materials at the facility and confirm that the floor plan documents are consistent with the actual building
  D. Evaluate the building materials at the facility and confirm that the floor plan documents are consistent with the actual building

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  Explanation/Reference:

  A pre-design site visit in preparation for a predictive wireless LAN design is essential for gathering physical and environmental data about the site. The key tasks to be performed during such a visit include:

  Evaluating Building Materials: Different materials (concrete, glass, wood, etc.) have varying effects on RF signal propagation. Understanding the materials present helps in accurately predicting how signals will behave within the environment.

  Floor Plan Verification: Ensuring that the floor plan documents are an accurate representation of the actual building layout is crucial. Discrepancies between the floor plans and the physical layout can lead to inaccuracies in the predictive

  design.

  The other options, while potentially valuable in other contexts, are not directly related to preparing for a predictive design:

  Installing APs(option A) for testing co-channel interference is more aligned with an active site survey rather than a pre-design visit for a predictive design. Collecting information about security requirements(option B) is important but is not

  directly related to the physical aspects of the site that would impact a predictive design.

  Testing antenna types(option C) would typically be part of an active site survey or the actual deployment phase, not a pre-design visit for predictive modeling. Therefore, option D is the correct answer, focusing on evaluating physical aspects

  crucial for accurate predictive modeling.

  References:

  CWNA Certified Wireless Network Administrator Official Study Guide:

  ExamCWNA-109, by David D. Coleman and David A. Westcott. Best practices for conducting pre-design site visits in wireless network planning.

• Question 122:

  You are installing an AP to be used by 27 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?

  A. Channel 6, because it is always best to use this channel
  B. A 5 GHz channel, because channels 1 and 6 are 2.4 GHz channels they have no impact on the decision
  C. Channel 1, because it is best to use the channel with the lowest frequency
  D. Channel 11, because channels 1 and 6 are in use nearby
  B. A 5 GHz channel, because channels 1 and 6 are 2.4 GHz channels they have no impact on the decision

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  Explanation/Reference:

  A 5 GHz channel should be used for this AP because channels 1 and 6 are 2.4 GHz channels and they have no impact on the decision. The 5 GHz frequency band offers more non-overlapping channels than the 2.4 GHz frequency band, which reduces interference and improves performance. The 5 GHz frequency band also supports higher data rates and wider channel bandwidths than the 2.4 GHz frequency band, which increases capacity and throughput. The 5 GHz frequency band also has less interference from other devices and sources than the 2.4 GHz frequency band, which enhances reliability and quality of service. Therefore, it is recommended to use the 5 GHz frequency band for WLANs whenever possible. Channels 1 and 6 are two of the three non- overlapping channels in the 2.4 GHz frequency band (the other one is channel 11). They are used by a neighbor network in this scenario, but they do not affect the channel selection for this AP because they operate in a different frequency band than the 5 GHz frequency band. Channel 6 is not always best to use; it depends on the interference and congestion level in the environment. Channel 1 is not best to use because it has a lower frequency than channel 6; frequency does not determine channel quality or performance. Channel 11 is not best to use because it is also a 2.4 GHz channel and it may interfere with channels 1 and 6. References: CWNA-109 Study Guide, Chapter 4: Antenna Systems and Radio Frequency (RF) Components, page 113