Azure IoT provides a number of patterns and options to design and implement security in your IoT solutions.
One of the key components of the security architecture is the security of the cloud part, i.e.
how the different components of a solution can access the IoT Hub endpoints, minimizing the exposure to unauthorized access.
While building your solution, you design the access policies for three components: Event processor Device app Device manager component Which policy should you use for which component?
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer: D.
Option A is incorrect because device and service policies are swapped here, hence the answer is wrong.
Option B is incorrect because back-end services, like event processors, need the ServiceConnect permission to be able to retrieve messages from the IoT Hub.
registryRead is wrong in this context.
Option C is incorrect because grating iothubowner permission to components violates the principle of least necessary privileges and raises additional risk.
Option D is CORRECT because the event processor must be able to connect to service endpoints (to receive messages, file uploads etc.); the devices need DeviceConnect permissions to be able to send telemetry; the device manager service needs R/W access to the identity registry.
All components are granted the least privileges they need to their operation.
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In Azure IoT, security is a crucial aspect, and implementing security requires designing access policies for the different components in your solution. The three components mentioned in the question are the Event Processor, Device App, and Device Manager Component.
To design access policies for these components, you need to understand the different access levels and permissions that Azure IoT provides.
Azure IoT provides three access levels: Device level, Service level, and Registry level.
Device level access: This level of access is used for device-to-cloud communication, and it allows devices to send telemetry, receive commands, and receive updates.
Service level access: This level of access is used for cloud-to-device communication and allows cloud services to send commands to devices and receive device responses.
Registry level access: This level of access is used for managing devices and includes creating, updating, and deleting device identities and managing device properties.
Based on the above access levels, the access policies that should be used for the different components are:
Event Processor: This component processes messages that are received from the devices and are sent to the cloud. The Event Processor requires access to read messages from the IoT Hub, and for this reason, the policy that should be used is the "service" policy.
Device App: This component is responsible for device-to-cloud communication and therefore requires device level access. The policy that should be used for the Device App is the "device" policy.
Device Manager Component: This component is responsible for managing device identities and properties and requires registry level access. The policy that should be used for the Device Manager Component is the "registryReadWrite" policy.
Based on the above explanations, the correct answer is (D) service; device; registryReadWrite.