As part of your industrial IoT solution, you have 10 wind turbines equipped with several sensors. All of these sensors send thousands of telemetry data to an IoT hub. You have built a solution that provides real-time visibility, on-the-fly analysis of key data for the operations. For troubleshooting and further analysis, you are told that you can use the Connections and Device telemetry logs collected and sent to Log Analytics automatically by Azure Monitor. 
Is that sufficient to solve the problem?

Answer options:

A.Yes
B.No

Correct Answer: B
Option A is incorrect because, to make resource log data available for later use, a diagnostic setting must be configured in the IoT Hub for redirecting data into one of the three destinations: Log Analytics, Event hubs, Storage account. No automatic log collection takes place.
Option B is CORRECT because, by default, resource logs are not collected. Resource logs (like Connections and Device telemetry) are generated automatically by Azure resources (like IoT Hub), but for them to be collected, you also need to configure a diagnostic setting in IoT Hub.
Diagram: 

References: 

https://docs.microsoft.com/en-us/azure/iot-hub/monitor-iot-hub-reference
https://docs.microsoft.com/en-us/azure/azure-monitor/platform/diagnostic-settings#destinations