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111. Frage
An RF signal sometimes bends as it passes through a material rather than around an obstacle. What is the RF behavior that this statement best describes?
Antwort: A
Begründung:
Refraction is the bending of an RF signal as it passes through a material of different density. Refraction can cause the signal to change its direction and angle of arrival. For example, when a light beam passes from air to water, it bends because of the difference in the refractive index of the two mediums. Similarly, when an RF signal passes from one medium to another, such as from air to glass, it can bend due to the change in the dielectric constant of the materials12. References: 1:CWNA-109Official Study Guide, page 67 2: Refraction
112. Frage
You are troubleshooting a client problem with a 2.4 GHz WLAN connection. The client is experiencing surprisingly low data rates during the work day. You analyze the workspace outside of business hours and detect a strong signal with a typical noise floor at the client location. During working hours, the user works with a laptop in the area and uses an external USB hard drive for continuous data access. The user also states that the laptop works as expected on her home network. The user working approximately 8 feet away from this client experiences no problems.
Based on this information, what is the likely cause of the problem?
Antwort: C
Begründung:
The likely cause of the problem is that the external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use. USB 3.0 devices are known to generate radio frequency interference (RFI) in the 2.4 GHz band due to their high data transfer rates and harmonics. This RFI can increase the noise floor and degrade the signal-to-noise ratio (SNR) of WLAN devices operating in the same band. This can result in lower data rates, reduced throughput, increased retransmissions, and poor performance. The problem may not occur outside of business hours or on the user's home network because of different usage patterns or environmental factors. References: [CWNP Certified Wireless Network Administrator Official StudyGuide:
ExamCWNA-109], page 527; [CWNA: Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 497.
113. Frage
What networking component connects multiple access points together and to other networking infrastructure, such as a switch, allowing an Extended Service Set to function as a unified network?
Antwort: B
Begründung:
The Distribution System (DS) is the underlying network infrastructure, typically the wired Ethernet network, that connects multiple access points together within an Extended Service Set (ESS).
The Distribution System allows data frames to be forwarded between different APs, and out to other network resources, enabling a seamless roaming experience for client stations as they move between the coverage areas of different APs that are all part of the same ESS.
114. Frage
In a mesh BSS (MBSS), according to the 802.11 standard, what device connect the mesh to an Ethernet network?
Antwort: B
Begründung:
A mesh portal is a device that connects a mesh BSS (MBSS) to an Ethernet network, such as the Internet. A mesh portal acts as a bridge between the wired and wireless domains, and allows the mesh stations to communicate with external networks. A mesh portal is also a mesh point, which means it can forward traffic within the MBSS.
115. Frage
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?
Antwort: C
Begründung:
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: Exam CWNA-109, by David D.
Coleman and David A. Westcott.
Best practices for conducting pre-design site visits in wireless network planning.
116. Frage
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