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| Certification Vendor: | CWNP |
|---|---|
| Exam Name: | CWNP Certified Wireless Network Administrator (CWNA) |
| Exam Number: | CWNA-109 |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 60 |
| Related Certifications: | Certified Wireless Network Administrator (CWNA) |
| Exam Price: | USD 250 |
| Passing Score: | 70% |
| Available Languages: | English |
| Certificate Validity Period: | 3 years |
| Exam Format: | Multiple Select, Drag-and-Drop, Multiple Choice |
| 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/ |
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NEW QUESTION # 139
You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of this connection?
Answer: A
Explanation:
The data rate of a signal is the speed that the data bits in individual 802.11 data frames are sent, but it does not account for the actual amount of data that can be transmitted over time. The throughput of a connection is the flow of information over time, which is affected by various factors such as data encoding, modulation, encryption, airtime utilization, noise levels, interference, etc. Therefore, the throughput is always lower than the data rate. According to one of the web search results1, the actual throughput is normally 60-70 percent of the supported data rates. So, for a connection with a data rate of 150 Mbps, the expected throughput would be around 90-105 Mbps.
NEW QUESTION # 140
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
Answer: D
Explanation:
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.
NEW QUESTION # 141
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. References: [CWNP Certified Wireless Network Administrator Official StudyGuide:
ExamCWNA-109], page 527; [CWNA: Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 497.
NEW QUESTION # 142
You are installing an AP to be used by 27 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?
Answer: B
Explanation:
A 5 GHz channel should be used for this AP because channels 1 and 6 are 2.4 GHz channels and they have no impact on the decision. The 5 GHz frequency band offers more non- overlapping channels than the 2.4 GHz frequency band, which reduces interference and improves performance. The 5 GHz frequency band also supports higher data rates and wider channel bandwidths than the 2.4 GHz frequency band, which increases capacity and throughput.
The 5 GHz frequency band also has less interference from other devices and sources than the
2.4 GHz frequency band, which enhances reliability and quality of service. Therefore, it is recommended to use the 5 GHz frequency band for WLANs whenever possible. Channels 1 and
6 are two of the three non-overlapping channels in the 2.4 GHz frequency band (the other one is channel 11). They are used by a neighbor network in this scenario, but they do not affect the channel selection for this AP because they operate in a different frequency band than the 5 GHz frequency band. Channel 6 is not always best to use; it depends on the interference and congestion level in the environment. Channel 1 is not best to use because it has a lower frequency than channel 6; frequency does not determine channel quality or performance.
Channel 11 is not best to use because it is also a 2.4 GHz channel and it may interfere with channels 1 and 6.
NEW QUESTION # 143
What statement about the beamwidth of an RF antenna is true?
Answer: D
Explanation:
The beamwidth of an RF antenna is the angular measure of how wide the main lobe of radiation is. The main lobe is the area where the signal strength is highest and most concentrated. The beamwidth is calculated at the points where the main lobe decreases power by 3 dB, which means it is half of the maximum power. The beamwidth can be measured in both horizontal and vertical planes, depending on how the antenna is oriented.
The horizontal beamwidth is also called azimuth, while the vertical beamwidth is also called elevation. The beamwidth patterns on an antenna polar chart indicate how the RF energy is distributed in different directions. References: 1, Chapter 2, page 66; 2, Section 2.3
NEW QUESTION # 144
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