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CWNP Exam CWISA-102 Topic 2 Question 12 Discussion

Actual exam question for CWNP's CWISA-102 exam
Question #: 12
Topic #: 2
[All CWISA-102 Questions]

You are troubleshooting a problem with a wireless solution that uses MQTT where the IoT end devices are not reporting to the MQTT server/broker. At what Layer of the OSI Model should troubleshooting begin when using a bottom-up method?

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Suggested Answer: A

Bottom-Up Troubleshooting:The OSI model provides a structured diagnostic approach. Starting at Layer 1 ensures basic physical connectivity issues are ruled out first.

MQTT Relies on IP:MQTT operates at a higher layer of the OSI model, relying on TCP/IP (Layers 4 and 3) for communication. Problems at the physical layer will disrupt everything built upon it.

Checking the Fundamentals:Before investigating complex application issues (MQTT), verify cables, link lights, Wi-Fi signal strength, etc.

References:

OSI Model:Descriptions of the seven layers, emphasizing the foundation provided by Layer 1 (Physical).

Network Troubleshooting Guides:Resources that outline common Layer 1 problems and their symptoms.


by Xuan at Jun 28, 2024, 02:40 PM

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Desirae
4 months ago
I believe Layer 1 is the best starting point, as it helps to ensure the basic connectivity is working before moving up the OSI model.
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Yuonne
4 months ago
I think starting at Layer 4 might be more efficient, as it deals with transport protocols that could be causing the problem.
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Gracia
4 months ago
Well, if it's a wireless MQTT solution, I'd start at Layer 1 too. Gotta make sure the signal is getting through before anything else.
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Beckie
3 months ago
But wouldn't you want to start at the lowest layer first to rule out any hardware issues?
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Aide
3 months ago
Agreed, we need to make sure the wireless connection is working properly.
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Rosalind
3 months ago
Let's start troubleshooting at Layer 1 to check the signal.
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Yaeko
4 months ago
B) Layer 4
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Evette
4 months ago
Yeah, checking the physical layer is key. Can't do much if the signal isn't strong.
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Lajuana
4 months ago
A) Layer 1
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Leandro
4 months ago
I agree with Mira, Layer 1 is the physical layer where issues with connectivity can be identified.
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Paris
4 months ago
Haha, classic networking troubleshooting. Bet you the problem is just a loose WIFI antenna or something. Layer 1 all the way!
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Mira
4 months ago
I think troubleshooting should begin at Layer 1.
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Delbert
4 months ago
I agree, Layer 1 is the way to go. Gotta make sure the hardware and cabling are all working before you can even think about the upper layers.
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Isidra
4 months ago
Agreed, gotta make sure everything is connected properly.
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Ocie
4 months ago
Let's start at Layer 1 to check the hardware.
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Stephen
5 months ago
Layer 1 seems like the logical place to start troubleshooting the wireless connection issue. Can't get data to the MQTT server if the physical layer is not functioning properly.
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Lindsay
4 months ago
Agreed, the physical layer is crucial for the wireless connection to work.
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Lynelle
4 months ago
Let's start troubleshooting at Layer 1.
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