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CWNP Exam CWISA-102 Topic 2 Question 9 Discussion
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?
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.
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