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You have an Azure subscription that contains an Azure IoT hub and two Azure IoT Edge devices named Device1 and Device2.
You need to ensure that the IoT hub only accepts connections from Device1 and Device2.
What should you configure?
A. Azure API Management
B. Azure Active Directory (Azure AD) Identity Protection
C. Azure Defender for IoT
D. an IP filter
Correct Answer: B
You can use Azure Active Directory (Azure AD) to authenticate requests to Azure IoT Hub service APIs, like create device identity and invoke direct method. You can also use Azure role-based access control (Azure RBAC) to authorize those same service APIs. By using these technologies together, you can grant permissions to access IoT Hub service APIs to an Azure AD security principal. This security principal could be a user, group, or application service principal.
Note: There are three different ways for controlling access to IoT Hub:
1.
Azure Active Directory (Azure AD) integration for service APIs. Azure provides identity-based authentication with AAD and fine-grained authorization with Azure role-based access control (Azure RBAC). Azure AD and RBAC integration is supported for IoT hub service APIs only.
2.
Shared access signatures lets you group permissions and grant them to applications using access keys and signed security tokens.
3.
Per-device security credentials. Each IoT Hub contains an identity registry For each device in this identity registry, you can configure security credentials that grant DeviceConnect permissions scoped to the that device's endpoints.
Reference: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-dev-guide-azure-ad-rbac
You have an Azure loT hub that has 500 registered devices.
You need to send device twin change events to Azure Service Bus in real time
Which blade of the loT hub should you configure?
A. Events
B. Metrics
C. Message routing
D. Diagnostic settings
Correct Answer: C
You need to recommend a solution to keep device properties synced to IoT Hub. The solution must minimize data loss caused by the connectivity issues.
What should you include in the recommendation?
A. Azure Event Grid
B. a cloud-to-device message
C. IoT Hub device twins
D. the IoT Hub direct method
Correct Answer: C
Scenario: You discover connectivity issues between the IoT gateway devices and iothub1, which cause IoT devices to lose connectivity and messages.
To synchronize state information between a device and an IoT hub, you use device twins. A device twin is a JSON document, associated with a specific device, and stored by IoT Hub in the cloud where you can query them. A device twin contains desired properties, reported properties, and tags.
Reference: https://docs.microsoft.com/en-us/azure/iot-hub/tutorial-device-twins
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