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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Protocols and Devices | 20% | - 802.11 frame types and formats
|
| Topic 2: WLAN Network Architecture and Design Concepts | 15% | - WLAN deployment architectures
|
| Topic 3: Radio Frequency (RF) Technologies | 20% | - Antenna concepts and types
|
| Topic 4: WLAN Regulations and Standards | 15% | - Regulatory bodies and frequency bands
|
| Topic 5: WLAN Network Security | 15% | - Authentication and encryption
|
| Topic 6: WLAN Troubleshooting and Management | 15% | - Monitoring and maintenance
|
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NEW QUESTION # 38
Which mechanism, defined as part of 802.11h, allows an AP to detect and avoid interference with radar systems by dynamically changing channels?
Answer: B
Explanation:
Dynamic Frequency Selection (DFS) is a mechanism required on certain 5 GHz channels that were originally allocated to radar systems, such as weather and military radar. DFS-capable APs continuously monitor the channel for radar signatures. If radar is detected, the AP must vacate the channel and select a different one to avoid interfering with the radar system. DFS, along with Transmit Power Control (TPC), was introduced through the 802.11h amendment to allow 802.11 devices to coexist with radar systems in the 5 GHz band.
NEW QUESTION # 39
What security solution is required to be used in place of Open System Authentication for all open network
802.11 implementations in the 6 GHz band?
Answer: D
NEW QUESTION # 40
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?
Answer: B
Explanation:
VHT TXOP (Very High Throughput Transmit Opportunity) power save is a feature introduced with the
802.11ac amendment, which is designed to improve the power efficiency of devices connected to a WLAN.
This feature enhances battery life in several ways, compared to the legacy Power Save mode:
* Enhanced Power Saving: VHT TXOP power save allows devices to disable more components of the WLAN transceiver when they are in a low power state. This reduces the power consumption during periods when the device is not actively transmitting or receiving data.
* Intelligent Wake-Up Mechanisms: It employs more sophisticated mechanisms for devices to determine when they need to wake up and listen to the channel, further reducing unnecessary power usage.
* Optimized Operation: This power save mode is optimized for the high-throughput environment of
802.11ac networks, allowing devices to efficiently manage power while maintaining high performance.
Legacy Power Save mode, introduced in earlier versions of the 802.11 standards, does not provide the same level of component disablement or the intelligent wake-up mechanisms found in VHT TXOP power save, making option B the correct answer.
References:
IEEE 802.11ac-2013 Amendment: Enhancements for Very High Throughput for Operation in Bands below 6 GHz.
CWNA Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109, by David D.
Coleman and David A. Westcott.
NEW QUESTION # 41
During a post-implementation survey, you have detected a non-802.11 wireless device transmitting in the area used by handheld 802.11g scanners. What is the most important factor in determining the impact of this non-802.11 device?
Answer: B
Explanation:
Airtime Utilization is a per-channel statistic that defines what percentage of the channel is currently being used, and what percentage is therefore free. Airtime usage can come from: Data traffic to and from client devices. Interference from WiFi and non-WiFi sources. Management overhead from APs and client devices.
NEW QUESTION # 42
What can an impedance mismatch in the RF cables and connectors cause?
Answer: C
Explanation:
VSWR stands for Voltage Standing Wave Ratio, which is a measure of how well the impedance of the RF cable and connectors matches the impedance of the transmitter and the antenna. Impedance is the opposition to the flow of alternating current in an RF circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. A perfect impedance match would have a VSWR of 1:1, meaning that all the power is transferred from the transmitter to the antenna, and none is reflected back. However, in reality, there is always some degree of mismatch, which causes some power to be reflected back to the transmitter, creating standing waves along the cable. This reduces the efficiency and performance of the wireless system, and can also damage the transmitter. Excessive VSWR can be caused by using poor quality or damaged cables and connectors, or by using components that have different impedance ratings123. References: CWNA-
109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 90; CWNA-109 Study Guide, Chapter 2:
Radio Frequency Fundamentals, page 86; CWNP website, CWNA Certification.
NEW QUESTION # 43
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