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Microsoft Azure IoT Developer Sample Questions (Q111-Q116):

NEW QUESTION # 111
You are developing an Azure IoT Central application.
You add a new custom device template to the application.
You need to add a fixed location value to the device template. The value must be updated by the physical IoT device, read-only to device operators, and not graphed by IoT Central.
What should you add to the device template?

• A. a Location property
• B. a Location telemetry
• C. a Cloud property

Answer: A Explanation:
Explanation
For example, a builder can create a device template for a connected fan that has the following characteristics:
* Sends temperature telemetry
* Sends location property
Reference:
https://docs.microsoft.com/en-us/azure/iot-central/core/howto-set-up-template
NEW QUESTION # 112
You have an Azure IoT solution that includes an Azure IoT Hub named Hub1 and an Azure IoT Edge device named Edge1. Edge1 connects to Hub1.
You need to deploy a temperature module to Edge1. What should you do?

• A. Create an IoT Edge deployment manifest that specifies the temperature module and the route to $upstream.
  From a Bush prompt, run the following command:
  az iot edge set-modules -device-id Edge1 -hub-name Hub1 -content C:\deploymentMan1.json
• B. Create an IoT Edge deployment manifest that specifies the temperature module and the route to
  $upstream. From a Bush prompt, run the following command:
  az iot hub monitor-events-device-id Edge1 -hub-name Hub1
• C. From the Azure portal, navigate to Hub1 and select IoT Edge. Select Edge1, and then select Manage Child Devices. From a Bash prompt, run the following command:
  az iot edge set-modules -device-id Edge1 -hub-name Hub1 -content C:
  \deploymentMan1.json
• D. From the Azure portal, navigate to Hub1 and select IoT Edge. Select Edge1, select Device Twin, and then set the deployment manifest as a desired property. From a Bash prompt, run the following command az iot hub monitor-events-device-id Edge1 -hub-name Hub1

Answer: A Explanation:
You deploy modules to your device by applying the deployment manifest that you configured with the module information.
Change directories into the folder where your deployment manifest is saved. If you used one of the VS Code IoT Edge templates, use the deployment.json file in the config folder of your solution directory and not the deployment.template.json file.
Use the following command to apply the configuration to an IoT Edge device:
az iot edge set-modules --device-id [device id] --hub-name [hub name] --content [file path]
Reference:
https://docs.microsoft.com/en-us/azure/iot-edge/how-to-deploy-modules-cli
NEW QUESTION # 113
You need to enable telemetry message tracing through the entire IoT solution.
What should you do?

• A. Upload IoT device logs by using the File upload feature.
• B. Enable the DeviceTelemetry diagnostic log and stream the log data to an Azure event hub.
• C. Monitor device lifecycle events.
• D. Implement distributed tracing.

Answer: D Explanation:
IoT Hub is one of the first Azure services to support distributed tracing. As more Azure services support distributed tracing, you'll be able trace IoT messages throughout the Azure services involved in your solution.
Note:
Enabling distributed tracing for IoT Hub gives you the ability to:
* Precisely monitor the flow of each message through IoT Hub using trace context. This trace context includes correlation IDs that allow you to correlate events from one component with events from another component. It can be applied for a subset or all IoT device messages using device twin.
* Automatically log the trace context to Azure Monitor diagnostic logs.
* Measure and understand message flow and latency from devices to IoT Hub and routing endpoints.
Start considering how you want to implement distributed tracing for the non-Azure services in your IoT solution.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-distributed-tracing Monitor, troubleshoot, and optimize IoT solutions Question Set 2
NEW QUESTION # 114
Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
After you answer a question in this question, you will NOT be able to return to it. As a result, these questions will not appear in the review screen.
You have an Azure IoT solution that includes an Azure IoT hub, a Device Provisioning Service instance, and
1,000 connected IoT devices.
All the IoT devices are provisioned automatically by using one enrollment group. You need to temporarily disable the IoT devices from the connecting to the IoT hub.
Solution: From the Device Provisioning Service, you disable the enrollment group, and you disable device entries in the identity registry of the IoT hub to which the IoT devices are provisioned.
Does the solution meet the goal?

• A. No
• B. Yes

Answer: B Explanation:
Explanation
You may find it necessary to deprovision devices that were previously auto-provisioned through the Device Provisioning Service.
In general, deprovisioning a device involves two steps:
1.Disenroll the device from your provisioning service, to prevent future auto-provisioning. Depending on whether you want to revoke access temporarily or permanently, you may want to either disable or delete an enrollment entry.
2.Deregister the device from your IoT Hub, to prevent future communications and data transfer. Again, you can temporarily disable or permanently delete the device's entry in the identity registry for the IoT Hub where it was provisioned.
Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-unprovision-devices
NEW QUESTION # 115
What should you do to identify the cause of the connectivity issues?

• A. Use the heartbeat pattern to send messages from the IoT devices to iothub1.
• B. Enable the collection of the Connections diagnostics logs and set up alerts for the connected devices count metric.
• C. Send cloud-to-device messages to the IoT devices.
• D. Monitor the connection status of the device twin by using an Azure function.

Answer: B Explanation:
Explanation
Scenario: You discover connectivity issues between the IoT gateway devices and iothub1, which cause IoT devices to lose connectivity and messages.
To log device connection events and errors, turn on diagnostics for IoT Hub. We recommend turning on these logs as early as possible, because if diagnostic logs aren't enabled, when device disconnects occur, you won't have any information to troubleshoot the problem with.
Step 1:
1.Sign in to the Azure portal.
2.Browse to your IoT hub.
3.Select Diagnostics settings.
4.Select Turn on diagnostics.
5.Enable Connections logs to be collected.
6.For easier analysis, turn on Send to Log Analytics (see pricing).
Step 2:
Set up alerts for device disconnect at scale
To get alerts when devices disconnect, configure alerts on the Connected devices (preview) metric.
Reference:
https://docs.microsoft.com/bs-cyrl-ba/azure/iot-hub/iot-hub-troubleshoot-connectivity
NEW QUESTION # 116
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