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CWNP CWNA-109 認定試験の出題範囲：

トピック出題範囲
トピック 1
  • WLAN Network Security: It addresses the concepts of weak security options, security mechanisms for enterprise WLANs, and security options and tools used in wireless networks.
トピック 2
  • Radio Frequency (RF) Technologies: This topic explains the basic features and behavior of RF. It also discusses applying the basic concepts of RF mathematics and measurement. Lastly, the topic covers RF signal characteristics and the functionality of RF antennas.
トピック 3
  • WLAN Protocols and Devices: It focuses on terminology related to the 802.11 MAC and PHY, the purpose of the three main 802.11 frame types, MAC frame format, and 802.11 channel access methods.
トピック 4
  • RF Validation and WLAN remediation: This topic covers RF interference, WLAN performance, the basic features of validation tools, and common wireless issues.
トピック 5
  • WLAN Regulations and Standards: The topic discusses the roles of WLAN and networking industry organizations. It also addresses the concepts of various Physical Layer (PHY) solutions, spread spectrum technologies, and 802.11 WLAN functional concepts.

>> CWNA-109テストサンプル問題 <<

CWNA-109試験対策書 & CWNA-109資格講座

CWNA-109試験の質問は、Japancertお客様のニーズを最大限に満たすことができます。また、CWNA-109学習教材は、お客様の観点から最大限に設計されています。 したがって、運用の複雑さを心配する必要はありません。 システムの学習インターフェイスに入り、WindowsソフトウェアでCWNA-109学習教材の練習を開始すると、インターフェイスに小さなボタンが表示されます。 これらのボタンには回答が表示され、学習プロセスを妨げないように、CWNA-109試験クイズのCWNP Wireless Network Administrator (CWNA)学習中に回答を非表示にすることができます。 すべての面が完璧です。

CWNP Wireless Network Administrator (CWNA) 認定 CWNA-109 試験問題 (Q34-Q39):

質問 # 34
What is the final step in an effective troubleshooting process?

正解：D

解説：
The final step in an effective troubleshooting process is to document the results. Documentation is essential for keeping track of the problem history, the actions taken, the solutions implemented, and the outcomes achieved. Documentation can also help to prevent future problems, improve best practices, and provide feedback for improvement. Documentation should include relevant information such as problem description, symptoms, root cause analysis, resolution steps, verification methods, and lessons learned. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-
109], page 513; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-
109], page 483.


質問 # 35
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

正解：A

解説：
In the 2.4 GHz frequency band used for 802.11 wireless networks, the channel bandwidth is typically 20 MHz, but the actual frequency spread of each channel is about 22 MHz due to the modulation techniques used. This spread causes overlap between adjacent channels, which can lead to interference and degrade network performance. To avoid this, it's essential to use non-overlapping channels.
The three non-overlapping channels in the 2.4 GHz band are 1, 6, and 11. Each of these channels is spaced sufficiently apart to avoid interference with each other:
* Channel 1: Centered at 2.412 GHz.
* Channel 6: Centered at 2.437 GHz.
* Channel 11: Centered at 2.462 GHz.
Given the options provided, option C (1 and 5) is the closest to a pair of non-overlapping channels, although in practice, channel 5 would still cause some interference with channel 1 due to the 22 MHz spread. The ideal choice for non-overlapping channels would be any two channels among 1, 6, and 11, but this is not an option provided. Therefore, within the given options, 1 and 5 are the best choice, understanding that in a real-world scenario, 1 and 6 or 6 and 11 would be preferred to avoid overlap.
References:
* CWNA Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109, by David D: Coleman and David A. Westcott.
* Understanding 2.4 GHz channel arrangement and interference patterns in 802.11 wireless networks.


質問 # 36
A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following methods is commonly used to locate the controllers by the APs?

正解：A

解説：
DHCP (Dynamic Host Configuration Protocol) is a commonly used method to locate the controllers by the APs in a WLAN that is implemented using wireless controllers. DHCP is a protocol that allows a device to obtain an IP address and other network configuration parameters from a server. In a wireless controller scenario, the APs can use DHCP to request an IP address from a DHCP server, which can also provide the IP address or hostname of the wireless controller as an option in the DHCP response. This way, the APs can discover the wireless controller and establish a connection with it. Alternatively, the APs can also use other methods to locate the wireless controller, such as DNS (Domain Name System), broadcast or multicast discovery, or manual configuration. References: 1, Chapter 8, page 309; 2, Section 5.2


質問 # 37
Which one of the following is not a factor considered when calculating the Link Budget for an outdoor point-to- point WLAN bridge link?

正解：B

解説：
MU-MIMO capabilities of the bridges are not a factor considered when calculating the Link Budget for an outdoor point-to-point WLAN bridge link. The Link Budget is a calculation of the expected signal strength at the receiver based on various factors that affect the RF transmission.
Some of these factors are operating frequency, transmit power, receive antenna gain, free space path loss, cable loss, connector loss, and environmental loss. MU-MIMO stands for Multi-User Multiple Input Multiple Output, which is a technology that allows multiple devices to communicate simultaneously using multiple spatial streams. MU-MIMO is not relevant for a point-to-point link, where there are only two devices involved.


質問 # 38
What can cause excessive VSWR in RF cables used to connect a radio to an antenna?

正解：B

解説：
Impedance is the measure of opposition to the flow of alternating current (AC) in a circuit.
Impedance mismatch occurs when the impedance of the radio does not match the impedance of the antenna or the cable. This causes some of the transmitted or received signal to be reflected back, resulting in a loss of power and efficiency. The voltage standing wave ratio (VSWR) is a metric that indicates the amount of impedance mismatch in a transmission line. A higher VSWR means a higher impedance mismatch and a lower signal quality. A VSWR of 1:1 is ideal, meaning there is no impedance mismatch and no reflected power. A VSWR of 2:1 means that for every 2 units of forward power, there is 1 unit of reflected power.
The other options are not correct because they do not affect the VSWR in RF cables. A high gain yagi antenna or a high gain parabolic dish antenna can increase the signal strength and directionality, but they do not cause impedance mismatch in the cable. Radio output power above
100 mW but below 400 mW is within the acceptable range for most WLAN devices and does not cause excessive VSWR in the cable.


質問 # 39
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