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Question 100 - CWNA-109 discussion

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You are a small business wireless network consultant and provide WLAN services for various companies. You receive a call from one of your customers stating that their laptop computers suddenly started experiencing much slower data transfers while connected to the WLAN. This company is located in a multi-tenant office building and the WLAN was designed to support laptops, tablets and mobile phones. What could cause a sudden change in performance for the laptop computers?

A.
The sky was not as cloudy that day as it typically is and the sun also radiates electromagnetic waves.
Answers
A.
The sky was not as cloudy that day as it typically is and the sun also radiates electromagnetic waves.
B.
A new tenant in the building has set their AP to the same RF channel that your customer is using.
Answers
B.
A new tenant in the building has set their AP to the same RF channel that your customer is using.
C.
The antennas in the laptops have been repositioned.
Answers
C.
The antennas in the laptops have been repositioned.
D.
A few of your customer's users have Bluetooth enabled wireless headsets.
Answers
D.
A few of your customer's users have Bluetooth enabled wireless headsets.
Suggested answer: B

Explanation:

A possible cause of a sudden change in performance for the laptop computers is thata new tenant in the building has set their AP to the same RF channel that your customer is using. This can create co-channel interference (CCI), which is a situation where two or more APs or devices use the same or overlapping channels in the same area. CCI can degrade the performance of WLANs by increasing contention, collisions, retransmissions, and latency. CCI can also reduce the effective range and throughput of WLANs by lowering the signal-to-noise ratio (SNR). To avoid or mitigate CCI, it is recommended to use non-overlapping channels, adjust transmit power levels, or implement channel management techniques such as dynamic frequency selection (DFS) or load balancing. The sky condition, antenna position, or Bluetooth headset are not likely to cause a sudden change in performance for the laptop computers.Reference:[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 81; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 71.

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asked 16/09/2024
Lea Kohl
46 questions
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