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Microsoft Azure IoT Developer Sample Questions (Q73-Q78):

NEW QUESTION # 73
You have 1,000 devices that connect to an Azure IoT hub.
You discover that some of the devices fail to send data to the IoT hub.
You need to ensure that you can use Azure Monitor to troubleshoot the device connectivity issues.
Which two actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

• A. From the Diagnostics settings of the IoT hub, select Send to Log Analytic.
• B. Collect the DeviceTelemetry, Connections, and Routes logs.
• C. Collect all metrics.
• D. Collect the JobsOperations, DeviceStreams, and FileUploadOperations logs.
• E. From the Diagnostics settings of the IoT hub, select Archive to a storage account.

Answer: A,B Explanation:
The IoT Hub resource logs connections category emits operations and errors having to do with device connections. The following screenshot shows a diagnostic setting to route these logs to a Log Analytics workspace:

Note: Azure Monitor: Route connection events to logs:
IoT hub continuously emits resource logs for several categories of operations. To collect this log data, though, you need to create a diagnostic setting to route it to a destination where it can be analyzed or archived. One such destination is Azure Monitor Logs via a Log Analytics workspace, where you can analyze the data using Kusto queries.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-troubleshoot-connectivity
NEW QUESTION # 74
You have an Azure IoT solution that includes an Azure IoT hub, 100 Azure IoT Edge devices, and 500 leaf devices.
You need to perform a key rotation across the devices.
Which three types of entities should you update? Each Answer presents part of the solution.
NOTE: Each correct selection is worth one point.

• A. the leaf device identities
• B. the $edgeHub module identity
• C. the iothubowner policy credentials
• D. the $edgeAgent module identity
• E. the leaf module identities
• F. the IoT Edge device identities

Answer: A,B,F Explanation:
To get authorization to connect to IoT Hub, devices and services must send security tokens signed with either a shared access or symmetric key. These keys are stored with a device identity in the identity registry.
An IoT Hub identity registry can be accessed like a dictionary, by using the deviceId or moduleId as the key. Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-control-access
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-identity-registry
NEW QUESTION # 75
You have 1,000 devices that connect to a standard tier Azure IoT hub.
All the devices are commissioned and send telemetry events to the built-in IoT Hub endpoint. You configure message enrichment on the events endpoint and set the enrichment value to $twin.tags.ipV4.
When you inspect messages on the events endpoint, you discover that all the messages are stamped with a string of "$twin.tags.ipV4".
What are two possible causes of the issue? Each Answer presents a complete solution.
NOTE: Each correct selection is worth one point.

• A. A standard tier IoT hub does not support device twin properties in message enrichments.
• B. Message enrichment cannot be added to messages going to a built-in endpoint.
• C. The ipV4 tag is a restricted twin property that is unavailable for message enrichment.
• D. The device sending the message has no device twin.
• E. The device twin path used for the value of the enrichment does not exist.
• F. The device twin property value used for message enrichment is set to "$twin.tags.ipV4".

Answer: D,E Explanation:
Explanation
In some cases, if you are applying an enrichment with a value set to a tag or property in the device twin, the value will be stamped as a string value. For example, if an enrichment value is set to $twin.tags.field, the messages will be stamped with the string "$twin.tags.field" rather than the value of that field from the twin.
This happens in the following cases:
(C) Your IoT Hub is in the standard tier, but the device sending the message has no device twin.
(E) Your IoT Hub is in the standard tier, but the device twin path used for the value of the enrichment does not exist. For example, if the enrichment value is set to $twin.tags.location, and the device twin does not have a location property under tags, the message is stamped with the string "$twin.tags.location".
Your IoT Hub is in the basic tier. Basic tier IoT hubs do not support device twins.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-message-enrichments-overview
NEW QUESTION # 76
You plan to deploy a standard tier Azure IoT hub.
You need to perform an over-the-air (OTA) update on devices that will connect to the IoT hub by using scheduled jobs.
What should you use?

• A. the device twin reported properties
• B. a device-to-cloud message
• C. a direct method
• D. a cloud-to-device message

Answer: C Explanation:
Releases via the REST API.
All of the operations that can be performed from the Console can also be automated using the REST API. You might do this to automate your build and release process, for example.
You can build firmware using the Particle CLI or directly using the compile source code API.
Note: Over-the-air (OTA) firmware updates are a vital component of any IoT system. Over-the-air firmware updates refers to the practice of remotely updating the code on an embedded device.
Reference:
https://docs.particle.io/tutorials/device-cloud/ota-updates/
NEW QUESTION # 77
During the POV phase, telemetry from IoT Hub stops flowing to the hot path. The cold path continues to work.
What should you do to restore the hot path?

• A. Create an explicit route for the hot path.
• B. Run the Test all routes action.
• C. Modify cold-route to send only some telemetry data to the cold path.
• D. Disable the fallback route.

Answer: A Explanation:
Explanation
Explanation/Reference:
Process and manage data
Question Set 3
NEW QUESTION # 78
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