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When using a spectrum to look for non Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a users workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?
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Which one of the following channels can be used for VHT transmissions according to the 802.11 specification?
What statement describes the authorization component of a AAA implementation?
A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following methods is commonly used to locate the controllers by the APs?
An IEEE 802.11 amendment is in the daft state. What impact does this draft amendment have on the 802.11 standard?
You must plan for POE in an office environment. Which one of these devices is least likely to be a POE PSE?
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You have received a report of poor wireless connections on the third floor of a building under your administration. Three individuals have reported the problem. Apparently, the connections are reporting a strong signal, but the users cannot access the Internet. With the problem identified, what is the next logical step in the troubleshooting process?
A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?

Question 93 - CWNA-109 discussion

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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?

A.
The AP is overloaded during the work day
Answers
A.
The AP is overloaded during the work day
B.
The drivers in the laptop are corrupt
Answers
B.
The drivers in the laptop are corrupt
C.
The laptop has a failing wireless adapter
Answers
C.
The laptop has a failing wireless adapter
D.
The external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use
Answers
D.
The external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use
Suggested answer: D

Explanation:

The likely cause of the problem is thatthe 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.Reference:[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 527; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 497.

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asked 16/09/2024
Kamil Stonjek
36 questions
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