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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IEEE 802.11 Network Operations | 15% | - Performance Optimization
|
| Topic 2: IEEE 802.11 Regulations and Standards | 15% | - Regulatory Bodies and Domains
|
| Topic 3: IEEE 802.11 Network Security | 15% | - Security Basics
|
| Topic 4: Radio Frequency (RF) Technologies | 15% | - RF Fundamentals
|
| Topic 5: IEEE 802.11 Protocols and Devices | 20% | - 802.11 Frame Types
|
| Topic 6: IEEE 802.11 Network Implementation | 20% | - Site Survey and Design
|
CWNPガイドトレントは、98〜100％の合格率と高いヒット率を高めます。弊社のCWNA-109テストトレントは認定エキスパートを使用し、質問と回答は実際の試験に基づいて入念に選択されます。私たちのCWNA-109研究急流の言語は理解しやすく、内容は重要な情報を簡素化しました。当社の製品は、機能を強化してCWNA-109試験、タイミング機能、自己学習および自己評価機能をシミュレートし、学習者がCWNA-109ガイドトレントを簡単かつ便利な方法でCWNP Wireless Network Administrator (CWNA)習得できるようにします。
質問 # 50
You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you document your findings, what term do you use to describe the problem in this configuration?
正解：C
解説：
The term used to describe the problem in this configuration is Co-Channel Interference (CCI)1. CCI occurs when multiple access points are on the same or overlapping channels, causing interference and degradation in network performance1. In this case, one AP is on channel 1 and the other is on channel 2, which are overlapping channels, leading to CCI1.
質問 # 51
What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?
正解：D
解説：
When a station scans for available wireless networks, it listens for beacon frames sent by APs. A beacon frame contains information about the BSS, such as SSID, supported rates, channel, security, etc. The station also measures the signal strength of the beacon frames, which indicates how well the station can communicate with the AP. The signal strength is usually expressed in dBm or RSSI units. The higher the signal strength, the better the connection quality and performance. Therefore, the station can use the signal strength of AP beacons as the primary metric to select the best AP for connectivity to the desired BSS12. References: CWNA-109 Study Guide, Chapter 6: Wireless LAN Devices and Topologies, page 249; CWNA-109Study Guide, Chapter
6: Wireless LAN Devices and Topologies, page 243.
質問 # 52
What frame type is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS?
正解：C
解説：
The frame type that is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS is RTS. RTS stands for Request to Send and is a control frame that is sent by a station to request access to the medium for a specified duration. The RTS frame contains the source and destination MAC addresses, as well as a Network Allocation Vector (NAV) value that indicates how long the medium will be occupied. The destination station responds with a Clear to Send (CTS) frame that echoes the NAV value and grants permission to the source station. All other stations in the BSS hear either the RTS or CTS frame and update their NAV timers accordingly, deferring their transmissions until the medium is free. The RTS/CTS mechanism can be used to prevent hidden node problems, reduce collisions, and protect high data rate frames that use features such as 802.11n or 802.11ac that may not be compatible with legacy stations. ACK, Beacon, and PS-Poll are not used to reserve the medium for high data rate frames. References: [CWNP Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 112; [CWNA: Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 102.
質問 # 53
You are a small business wireless network consultant and provide WLAN services for various companies.
You receive a call from one of your customers stating that their laptop computers suddenly started experiencing much slower data transfers while connected to the WLAN. This company is located in a multi- tenant office building and the WLAN was designed to support laptops, tablets and mobile phones. What could cause a sudden change in performance for the laptop computers?
正解：B
解説：
A possible cause of a sudden change in performance for the laptop computers is that a new tenant in the building has set their AP to the same RF channel that your customer is using. This can create co-channel interference (CCI), which is a situation where two or more APs or devices use the same or overlapping channels in the same area. CCI can degrade the performance of WLANs by increasing contention, collisions, retransmissions, and latency. CCI can also reduce the effective range and throughput of WLANs by lowering the signal-to-noise ratio (SNR). To avoid or mitigate CCI, it is recommended to use non-overlapping channels, adjust transmit power levels, or implement channel management techniques such as dynamic frequency selection (DFS) or load balancing. The sky condition, antenna position, or Bluetooth headset are not likely to cause a sudden change in performance for the laptop computers. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 81; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 71.
質問 # 54
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：C
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.
References:
CWNA Certified Wireless Network Administrator Official Study Guide: Exam PW0-105, by David D.
Coleman and David A. Westcott.
Tools and techniques for wireless network analysis and troubleshooting.
質問 # 55
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