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| Certification Vendor: | CWNP |
|---|---|
| Exam Name: | CWNP Certified Wireless Network Administrator (CWNA) |
| Exam Number: | CWNA-109 |
| Certificate Validity Period: | 3 years |
| Exam Duration: | 90 minutes |
| Related Certifications: | Certified Wireless Network Administrator (CWNA) |
| Passing Score: | 70% |
| Real Exam Qty: | 60 |
| Exam Price: | USD 250 |
| Available Languages: | English |
| Exam Format: | Drag-and-Drop, Multiple Choice, Multiple Select |
| Sample Questions: | CWNP CWNA-109 Sample Questions |
| Exam Way: | Online (Proctored) or Authorized Testing Center |
| Pre Condition: | No formal prerequisites, but foundational networking knowledge recommended |
| Official Syllabus URL: | https://www.cwnp.com/certifications/cwna/ |
Whether you prefer web-based practice exam, desktop-based exam, or PDF real questions, we've got you covered. We believe that variety is key when it comes to CWNP CWNA-109 Exam Preparation, and that's why we offer three formats that cater to different learning styles and preferences.
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NEW QUESTION # 176
Your manager asked you to locate a solution that allows for centralized monitoring of WLAN performance over time. He wants a single pane of glass for administration and monitoring of the solution. What do you recommend?
Answer: D
Explanation:
The solution that you recommend is an Overlay WLAN monitoring solution. An Overlay WLAN monitoring solution is a system that uses dedicated sensors or probes to monitor the WLAN performance over time. The sensors are deployed throughout the WLAN coverage area and collect data on various metrics such as signal strength, noise level, channel utilization, interference, throughput, latency, packet loss, and QoS. The sensors send the data to a centralized server or appliance that analyzes the data and provides a single pane of glass for administration and monitoring of the solution. An Overlay WLAN monitoring solution can help to detect and troubleshoot WLAN issues, optimize WLAN performance, and generate reports and alerts.
NEW QUESTION # 177
A wireless engineer measures a high VSWR value on an antenna cable run. What does this indicate?
Answer: B
Explanation:
Voltage Standing Wave Ratio (VSWR) is a measurement used to determine how efficiently RF power is transmitted from a source, through a transmission line, to a load such as an antenna. A high VSWR value indicates a significant impedance mismatch somewhere in the RF path, which causes a portion of the signal to be reflected back toward the transmitter instead of being radiated. This reflected energy can reduce range and, in extreme cases, damage the transmitter.
An ideal VSWR value is close to 1:1, indicating minimal reflection.
NEW QUESTION # 178
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?
Answer: A
Explanation:
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.
NEW QUESTION # 179
What is a common source of RF interference in the 2.4 GHz ISM band that does not originate from an 802.11 device?
Answer: D
Explanation:
Microwave ovens are a well-known source of non-802.11 RF interference in the 2.4 GHz ISM band, as they operate by emitting energy at frequencies that overlap with the Wi-Fi spectrum, particularly around channel 9-11. Other common non-802.11 interference sources in this band include cordless phones, Bluetooth devices, wireless video cameras, and certain types of industrial, scientific, and medical equipment. These devices do not follow 802.11 protocols and can cause unpredictable interference that a spectrum analyzer is needed to identify, since standard Wi-Fi survey tools cannot detect non-802.11 energy.
NEW QUESTION # 180
You are troubleshooting a client problem with a 2.4 GHz WLAN connection. The client is experiencing surprisingly low data rates during the work day. You analyze the workspace outside of business hours and detect a strong signal with a typical noise floor at the client location. During working hours, the user works with a laptop in the area and uses an external USB hard drive for continuous data access. The user also states that the laptop works as expected on her home network. The user working approximately 8 feet away from this client experiences no problems.
Based on this information, what is the likely cause of the problem?
Answer: A
Explanation:
The likely cause of the problem is that the external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use. USB 3.0 devices are known to generate radio frequency interference (RFI) in the 2.4 GHz band due to their high data transfer rates and harmonics. This RFI can increase the noise floor and degrade the signal-to-noise ratio (SNR) of WLAN devices operating in the same band. This can result in lower data rates, reduced throughput, increased retransmissions, and poor performance. The problem may not occur outside of business hours or on the user's home network because of different usage patterns or environmental factors.
NEW QUESTION # 181
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