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Question 30

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?

    Correct Answer: C

    The laptop functions correctly on the user's home network, eliminating any possibility of a failing wireless adapter or corrupt drives in the laptop. The AP being overloaded is also ruled out since another user 8 feet away experiences no issues during the same period. Therefore, the most plausible cause is the external USB 3.0 hard drive creating significant interference in the 2.4 GHz band, causing increased noise and consequently lower data rates for the affected user.

Discussion
VPPOption: C

correct answer is C. USB 3.0 may be causing interference with 2.4GHz

CWNA

USB never make RF noise! answer is B

Cade47Option: C

I think the key to this topic is in the question "user 8' feet away work fine" I believe the answer to be C. Reference pg268 CWNA107 study guide states USB 3.0 can generate significant interference in the 2.4Ghz band

EAGOption: C

Answer is C. USB 3.0 can cause interference as Cade47 stated and referenced. In addition, reading the question carefully, we can eliminate options A and D, since the laptop works as expected at the user's home (unlike at office location) Option B can also be eliminated because another user 8 feet away, who will most likely be connected to the same AP is having no issues, thus the AP cannot be the problem in any way. This leaves option C.