Microsoft Azure Fundamentals AZ-900 Practice Exam 2026 – Complete Study Resource

The most appropriate Azure service for sending on-board diagnostic data from automobiles to the cloud is IoT Hub. This service is specifically designed to facilitate secure and reliable communication between IoT devices and the cloud. With IoT Hub, you can manage millions of devices, enabling bi-directional communication and providing the necessary features for telemetry data ingestion, such as the diagnostic data from vehicles.

IoT Hub supports various protocols that are often used in IoT scenarios, including MQTT, which is lightweight and ideal for sending telemetry data from devices. It also offers device management capabilities, ensuring that automobiles can be monitored and managed effectively, which is critical for an automobile manufacturing solution.

Other services, while related, do not directly meet the needs of this scenario. For instance, Event Hub is more suitable for big data streaming scenarios where large amounts of event data need to be ingested, analyzed, and processed in real time, but it lacks the specific device management and communication features designed for IoT use cases. IoT Central provides a managed application platform for IoT solutions but is less focused on direct device communication when compared to IoT Hub. Notification Hub, on the other hand, is geared toward sending push notifications to mobile devices rather than handling telemetry data from IoT devices