CWNP CWNA-109 Exam - Topic 4 Question 3 Discussion

Actual exam question for CWNP's CWNA-109 exam

Question #: 3
Topic #: 4

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?

AThe sky was not as cloudy that day as it typically is and the sun also radiates electromagnetic waves.

BA new tenant in the building has set their AP to the same RF channel that your customer is using.

CThe antennas in the laptops have been repositioned.

DA few of your customer's users have Bluetooth enabled wireless headsets.

Show Suggested Answer

Suggested Answer: B

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.

by Troy at Jun 22, 2024, 11:14 AM

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Sharika

3 months ago

Wait, the sun affects WLAN? That sounds a bit far-fetched!

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Royal

3 months ago

Yeah, I've seen this happen before with overlapping channels.

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Laurel

3 months ago

Bluetooth headsets can cause interference, but not usually that much.

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Benton

4 months ago

I doubt it's the antennas; they don't just reposition themselves.

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Dominic

4 months ago

Definitely a new tenant messing with the RF channels.

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Lillian

4 months ago

The RF channel overlap seems like the most plausible explanation, especially in a multi-tenant building. I should double-check the channel settings.

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Howard

4 months ago

I practiced a question similar to this, and I think Bluetooth devices can interfere with WLAN, but I'm not convinced it's the main issue here.

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Natalie

4 months ago

I'm not entirely sure, but I feel like the laptops' antennas being repositioned seems a bit unlikely to cause a sudden drop in performance.

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Ivan

5 months ago

I remember studying about interference issues, and I think a new tenant could definitely cause problems if they're on the same channel.

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Page

5 months ago

This seems like a classic wireless performance issue. I'd start by doing a site survey to see what other APs are in the area and check the channel utilization. Bluetooth devices are also a common culprit, so I'd look into that as well.

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Rima

5 months ago

Wait, the sun radiating electromagnetic waves? I'm not sure I follow that one. I'd be more inclined to look at the other options like co-channel interference or Bluetooth interference.

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Justine

5 months ago

Okay, I think I've got a good handle on this. The key is to identify any changes in the environment that could be causing interference with the laptops. I'll focus on checking the RF channel usage and Bluetooth devices first.

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Val

5 months ago

Hmm, I'm not entirely sure about this one. There could be a lot of different factors at play here. I'll need to think through the possible causes carefully.

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Lauran

5 months ago

This seems like a pretty straightforward wireless networking issue. I'd start by looking at potential interference sources like other APs or Bluetooth devices in the area.

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Mitsue

5 months ago

The rich picture seems like the obvious choice here. It's specifically designed to capture the complexity of a business situation and all the different elements involved. I feel good about selecting that option.

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Marylin

5 months ago

Hmm, I'm a little unsure on this one. I know VMware has a lot of different websites, so I'll have to think about which one would be the most authoritative source for Workspace ONE specifically.

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Amos

5 months ago

I'm a little confused by this question. All the options seem relevant to information governance, but I'm not sure which one is the single most important purpose. I'll have to make an educated guess on this one.

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