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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IEEE 802.11 Network Operations | 15% | - Troubleshooting
|
| Topic 2: IEEE 802.11 Protocols and Devices | 20% | - 802.11 Frame Types
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| Topic 3: IEEE 802.11 Network Security | 15% | - Encryption and Authentication
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| Topic 4: Radio Frequency (RF) Technologies | 15% | - RF Mathematics
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| Topic 5: IEEE 802.11 Network Implementation | 20% | - Site Survey and Design
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| Topic 6: IEEE 802.11 Regulations and Standards | 15% | - Regulatory Bodies and Domains
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質問 # 65
You are using a tool that allows you to see signal strength for all Aps in the area with a visual representation. It shows you SSIDs available and the security settings for each SSID. It allows you to filter by frequency band to see only 2.4 GHz networks or only 5 GHz networks. No additional features are available.
What kind of application is described?
正解：A
解説：
The tool described is a WLAN (Wireless Local Area Network) scanner tool. WLAN scanner tools are designed to provide information about the wireless networks in a given area, including:
Signal Strength: They show the signal strength of all access points (APs) in the vicinity, which is crucial for understanding the coverage area and potential interference. SSID Visualization: These tools display the SSIDs (Service Set Identifiers) of available networks, allowing users to identify different wireless networks easily. Security Settings Information: WLAN scanner tools often show the type of security implemented on each network, such as WPA2, WEP, etc.
Frequency Band Filtering: They allow users to filter and view networks based on the frequency band (2.4 GHz or 5 GHz), which is useful for analyzing network distribution and planning. While protocol analyzers, site survey utilities, and spectrum analyzers are also used in wireless networking, their functions are distinct from what is described:
Protocol Analyzers are more sophisticated and are used to capture and analyze network traffic.
Site Survey Utilities are used to map signal coverage and plan network layouts, often with more advanced features for detailed site surveys.
Spectrum Analyzers provide a detailed view of the frequency spectrum and non-Wi-Fi interference but don't typically focus on SSIDs or security settings. Thus, the correct answer is D, a WLAN scanner tool, based on the functionalities described.
質問 # 66
A network administrator notices that an RF signal is bending around the edge of a large obstacle, such as a building, allowing some signal to be received in an area that would otherwise be in an RF shadow. What phenomenon explains this behavior?
正解：D
解説：
Diffraction occurs when an RF wave encounters an obstacle with an irregular or sharp edge, causing the wave to bend around the object. This bending allows some of the signal to reach areas behind the obstruction that would otherwise be blocked, though the signal strength in that shadowed area is typically weaker. Diffraction is more pronounced at lower frequencies, which is one reason 2.4 GHz signals can sometimes propagate around obstacles more effectively than 5 GHz signals.
質問 # 67
Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?
正解：A
解説：
Patch and panel antennas are directional antenna types that are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation. These antennas have a flat rectangular shape and can be mounted on walls or ceilings to provide coverage in a specific direction. They have a moderate gain and a relatively wide beamwidth, making them suitable for multipath environments where signals can reflect off different surfaces and create multiple spatial streams. Patch and panel antennas can also support polarization diversity, which means they can transmit and receive both horizontally and vertically polarized waves, increasing the MIMO performance. References: 1, Chapter 2, page 72; 2, Section 2.4
質問 # 68
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?
正解：B
解説：
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
質問 # 69
As you prepare for a site survey in a multi-floor corporate office, you have learned about several wireless devices that support connection-oriented, real-time applications. These applications are sensitive to service interruptions and require excellent signal quality, low latency, and low loss.
For that reason, it is important to identify sources of RF interference as well as building characteristics that would cause RF blockage or dead spots.
What systems or environmental characteristics are most likely to cause interference or RF blockage and disrupt service for these applications? (Choose 2)
正解：B、C
質問 # 70
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