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CWNA-109試験トレントは3つのバージョンをブーストし、PDFバージョン、PCバージョン、APPオンラインバージョンが含まれます。 3つのバージョンは、CWNPそれぞれの強度と使用方法を高めます。たとえば、PCバージョンのCWNA-109試験トレントは、インストールソフトウェアアプリケーションをブーストし、実際のCWNA-109試験をシミュレートし、MSオペレーティングシステムをサポートし、練習用に2つのモードをブーストし、いつでもオフラインで練習できます。コンピューター、携帯電話、ラップトップでAPPオンラインバージョンのCWNA-109ガイドトレントを学習でき、最も便利な学習方法を選択できます。
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質問 # 87
What can cause excessive VSWR in RF cables used to connect a radio to an antenna?
正解：D
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 power12.
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 cable3.
References: 1:CWNA-109Official Study Guide, page 77 2: VSWR 3:CWNA-109Official Study Guide, page
81
質問 # 88
What technology allows an access point to use multiple antennas to transmit and receive multiple spatial streams simultaneously, increasing throughput and reliability by taking advantage of multipath?
正解：B
解説：
Multiple-Input Multiple-Output (MIMO) technology uses multiple antennas at both the transmitter and receiver to send and receive multiple spatial streams of data simultaneously over the same channel. MIMO takes advantage of multipath propagation rather than being hindered by it, using techniques such as spatial multiplexing to increase throughput, and Maximal Ratio Combining along with Transmit Beamforming to improve reliability. MIMO was introduced with 802.11n and remains a core component of 802.11ac and 802.11ax.
質問 # 89
Which spread spectrum technology, used by the original 802.11 and 802.11b amendments, divides data across a wide frequency band using a chipping code to provide resistance to narrowband interference?
正解：A
解説：
Direct Sequence Spread Spectrum (DSSS) is a spread spectrum technology used by the original
802.11 amendment and by 802.11b. DSSS spreads the data signal across a wider frequency band than would otherwise be necessary by combining the data with a redundant bit pattern called a chipping code. This spreading technique provides resistance to narrowband interference, since the loss of a few bits due to interference can be recovered through the redundancy provided by the chip sequence, at the cost of consuming more bandwidth than the original data would require.
質問 # 90
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：C、E
質問 # 91
You administer a WLAN that offers a guest SSID of GUESTNWORK. Users connect to the GUESTNWORK SSID, but report that they cannot browse the Internet. The devices simply report no Internet connection. What common problem causes this scenario?
正解：D
解説：
A common problem that causes this scenario is captive portal issues. A captive portal is a web page that requires users to authenticate or accept terms and conditions before accessing the Internet through a WLAN. A captive portal is often used for guest networks to provide security and control over the network access. A captive portal works by intercepting the user's web requests and redirecting them to the portal page until the user completes the required action. However, sometimes the captive portal may not work properly due to various reasons, such as browser settings, firewall rules, DNS configuration, or network errors. This can prevent the user from browsing the Internet or seeing the portal page. To troubleshoot captive portal issues, you can try to use a different browser, clear the browser cache andcookies, disable any VPN or proxy settings, manually enter the portal URL, or contact the network administrator. NTP issues, hardware issues, or IP routing issues are not common problems that cause this scenario. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 343; [CWNA: Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 333.
質問 # 92
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