CWNA-109 Fragen & Antworten & CWNA-109 Studienführer & CWNA-109 Prüfungsvorbereitung

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CWNP CWNA-109 Prüfungsplan:

Thema	Einzelheiten
Thema 1	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.
Thema 2	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.
Thema 3	RF Validation and WLAN remediation: This topic covers RF interference, WLAN performance, the basic features of validation tools, and common wireless issues.
Thema 4	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.
Thema 5	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.

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CWNP Wireless Network Administrator (CWNA) CWNA-109 Prüfungsfragen mit Lösungen (Q80-Q85):

80. Frage
An IEEE 802.11 amendment is in the daft state. What impact does this draft amendment have on the 802.11 standard?

A. The standard is changed to reflect the new capabilities as soon as an amendment enters the draft stage.
B. No impact: Until an amendment is ratified, it does not become part of the standard.
C. Devices will be released based on the draft amendment and the draft amendment features are part of the standard.
D. No impact: Draft amendments do not become part of the standard until a working group is formed.

Antwort: B

Begründung:
An IEEE 802.11 amendment is a proposed change or addition to the existing 802.11 standard, which defines the specifications and protocols for wireless LANs. An amendment goes through several stages of development, such as draft, sponsor ballot, and final approval, before it is ratified by the IEEE Standards Association and becomes part of the standard. Until then, it has no official impact on the standard, although some vendors may release products based on draft amendments to gain a competitive edge or to influence the final outcome of the amendment .

81. Frage
In a long-distance RF link, what statement about Fade Margin is true?

A. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.
B. The Fade Margin is a measurement of signal loss through free space and is a function of frequency and distance.
C. Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.
D. The Fade Margin of a long-distance radio link should be equivalent to the receiver's low noise filter gain.

Antwort: C

Begründung:
Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading. It is the difference between the receiver's sensitivity and the actual received signal level. A higher Fade Margin indicates a more robust link that can withstand interference, attenuation, or other factors that may reduce the signal strength. A lower Fade Margin means that the link is more susceptible to failure or performance degradation. Fade Margin is usually expressed in decibels (dB) and can be calculated by subtracting the receiver sensitivity from the received signal level. References: 1, Chapter 2, page
51; 2, Section 2.1

82. Frage
What term describes the bending of an RF signal as it passes from one medium into another medium of different density?

A. Diffraction
B. Scattering
C. Reflection
D. Refraction

Antwort: D

Begründung:
Refraction is the bending of an RF wave as it travels from one medium into a medium with a different density, such as when a signal passes through layers of the atmosphere with different temperatures and humidity levels. This bending occurs because the speed of the wave changes as it enters the new medium. Refraction can cause the signal path to curve, which is especially relevant in long-distance outdoor bridge links where atmospheric conditions can affect the predicted line-of-sight path.

83. Frage
You are troubleshooting a problem with interference from a non-802.11 device. Given that the device is not a WLAN device, you cannot use a protocol analyzer and have chosen to use a spectrum analyzer. You want to view the signal from the interfering device over time to see the activity that is generating.
What common spectrum analyzer view should you use for this analysis?

A. APs
B. Waterfall/Spectrogram
C. Real-time FFT
D. Clients

Antwort: B

Begründung:
The common spectrum analyzer view that you should use for this analysis is the Waterfall/Spectrogram view. The Waterfall/Spectrogram view shows the signal from the interfering device over time on a three-dimensional graph. The x-axis represents frequency, the y- axis represents time, and the z-axis represents amplitude or power. The color of each pixel indicates the signal strength at a given frequency and time. The Waterfall/Spectrogram view can help you identify the characteristics of the interference source, such as its frequency range, duty cycle, modulation type, and pattern.

84. Frage
What statement about 802.11 WLAN performance is true?

A. WLANs perform better as more wireless clients connect with each AP
B. To get the best performance out of an AP, you should disable data rates of 72 Mbps and lower
C. In modem networks, both centralized and distributed data forwarding work well for most standard office deployments
D. In most WLANs, no special skill or tuning is required to get peak performance

Antwort: C

Begründung:
The statement that in modern networks, both centralized and distributed data forwarding work well for most standard office deployments is true about WLAN performance. Data forwarding refers to how wireless frames are transmitted from wireless clients to wired networks or vice versa through wireless access points (APs). Centralized data forwarding means that all wireless frames are sent to a central controller or gateway before being forwarded to their destinations.
Distributed data forwarding means that wireless frames are forwarded directly by the APs to their destinations without going through a central controller or gateway. Both methods have their advantages and disadvantages, depending on the network size, topology, traffic pattern, security, and management requirements. However, in modern networks, both methods can achieve high performance and scalability for most standard office deployments, as they can leverage advanced features such as fast roaming, load balancing, quality of service, and encryption. The other statements about WLAN performance are false. In most WLANs, special skill or tuning is required to get peak performance, such as selecting the appropriate channel, power, data rate, and antenna settings. WLANs perform worse as more wireless clients connect with each AP, as they cause more contention and interference on the wireless medium. To get the best performance out of an AP, you should not disable data rates of 72 Mbps and lower, as they are needed for backward compatibility and range extension.

85. Frage
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