CWNP Exam CWISA-102 Topic 2 Question 12 Discussion

Actual exam question for CWNP's CWISA-102 exam

Question #: 12
Topic #: 2

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?

ALayer 1

BLayer 4

CLayer 5

DLayer 6

Show Suggested Answer

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

5 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

5 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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5 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

5 months ago

Agreed, gotta make sure everything is connected properly.

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Ocie

5 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

5 months ago

Agreed, the physical layer is crucial for the wireless connection to work.

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Lynelle

5 months ago

Let's start troubleshooting at Layer 1.

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