BONUS！！！ Topexam CWNA-109ダンプの一部を無料でダウンロード：https://drive.google.com/open?id=19N9JRHJ9fHv0X7Xc3WAXs560OqmUvQoL
弊社は君のCWNA-109試験に合格させるとともにまた一年の無料の更新のサービスも提供し、もしCWNA-109試験に失敗したら全額で返金いたします。しかしその可能性はほとんどありません。弊社は100%合格率を保証し、購入前にネットでダウンロードしてください。
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Troubleshooting and Management | 15% | - Monitoring and maintenance
|
| Topic 2: WLAN Network Architecture and Design Concepts | 15% | - WLAN deployment architectures
|
| Topic 3: WLAN Protocols and Devices | 20% | - Wireless hardware and software
|
| Topic 4: WLAN Network Security | 15% | - Security threats and mitigation
|
| Topic 5: WLAN Regulations and Standards | 15% | - Regulatory bodies and frequency bands
|
| Topic 6: Radio Frequency (RF) Technologies | 20% | - Antenna concepts and types
|
数年以来弊社のTopexamのIT試験分野での研究を通して、弊社はこの職業での重要な存在になります。弊社の開発したソフトは非常に全面的です。CWNPのCWNA-109試験ソフトは販売量が一番高いソフトの一で、受験生をよく助けて受験生に試験に合格させます。知られているのはCWNPのCWNA-109試験に合格すればITという職業でよく発展しています。
質問 # 134
You are evaluating access points for use in the 5 GHz frequency band. What PHY supports this band and supports 80 MHz channels?
正解：B
解説：
VHT stands for Very High Throughput, which is a physical layer (PHY) specification that supports the 5 GHz frequency band and supports 80 MHz channels. VHT is used by the IEEE 802.11ac standard, which is also known as Wi-Fi 5. VHT allows for higher data rates and more spatial streams than the previous HT (High Throughput) PHY, which is used by the IEEE 802.11n standard, also known as Wi-Fi 4. HT supports the 2.4 GHz and 5 GHz bands, but only supports up to 40 MHz channels The other options are not correct because:
ERP (option C) stands for Extended Rate PHY, which is a physical layer specification that supports the 2.4 GHz frequency band and supports up to 20 MHz channels. ERP is used by the IEEE 802.11g standard, which is also known as Wi-Fi 3. ERP allows for higher data rates than the previous DSSS (Direct Sequence Spread Spectrum) PHY, which is used by the IEEE 802.11b standard, also known as Wi-Fi OFDM (option D) stands for Orthogonal Frequency Division Multiplexing, which is a modulation technique that divides a signal into multiple subcarriers that are spaced orthogonally to each other. OFDM is not a physical layer specification, but a common feature of many PHY specifications, including ERP, HT, and VHT. OFDM allows for higher spectral efficiency and robustness against multipath interference than the previous CCK (Complementary Code Keying) modulation technique used by DSSS.
質問 # 135
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
正解：B
解説：
The short guard interval is an optional feature of 802.11n and 802.11ac that reduces the time between OFDM symbols from 800 ns to 400 ns. This can increase the data rate by about 11%, but also requires more precise timing and synchronization between the transmitter and the receiver. The short guard interval is only used when both the AP and the client support it and agree to use it . References: [CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 163; [CWNA-109Study Guide], Chapter 4:
Radio Frequency Signal and Antenna Concepts, page 157.
質問 # 136
What type of antenna is commonly used indoors, provides an omnidirectional horizontal radiation pattern, and is often mounted on a wall or built into an access point?
正解：B
解説：
A dipole antenna is a common omnidirectional antenna used in indoor WLAN deployments. It radiates RF energy in a 360-degree horizontal pattern, resembling a donut shape when viewed from the side, with nulls directly above and below the antenna. Dipole antennas are frequently built into access points or mounted externally, and are well-suited for environments where coverage is needed in all directions around the antenna, such as open office spaces.
質問 # 137
You were previously onsite at XYZ's facility to conduct a pre-deployment RF site survey. The WLAN has been deployed according to your recommendations and you are onsite again to perform a post- deployment validation survey.
When performing this type of post-deployment RF site survey voice over Wi-Fi, what is an action that must be performed?
正解：A
解説：
When performing a post-deployment validation survey for voice over Wi-Fi (VoWiFi), an action that must be performed is Application analysis with an active phone call on a VoWiFi handset.
Application analysis is a method of testing the performance of a specific application over the WLAN by measuring parameters such as throughput, latency, jitter, packet loss, MOS score, and R-value. Application analysis with an active phone call on a VoWiFi handset can help to evaluate the quality of service (QoS) and user experience of VoWiFi calls over the WLAN. It can also help to identify any issues or bottlenecks that may affect VoWiFi calls such as interference, roaming delays, or insufficient coverage.
質問 # 138
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: Exam CWNA-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 # 139
......
最短時間でCWNA-109試験に合格すると、Topexamすべての受験者の声になります。 しかし、圧倒的な学習教材で最も価値のある情報を選択する方法は、すべての試験官にとって頭痛の種です。 絶え間ない努力の後、CWNA-109学習ガイドは誰もが期待するものです。 当社の専門家は、コンテンツを簡素化し、お客様の重要なポイントを把握するだけでなく、CWNA-109準備資料を簡単な言語に再コンパイルしました。レジャー学習体験と、今後のCWNA-109 試験CWNP Wireless Network Administrator (CWNA)合格できます。
CWNA-109日本語版テキスト内容: https://www.topexam.jp/CWNA-109_shiken.html
無料でクラウドストレージから最新のTopexam CWNA-109 PDFダンプをダウンロードする：https://drive.google.com/open?id=19N9JRHJ9fHv0X7Xc3WAXs560OqmUvQoL