Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam

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Which service acts as a central message hub for IoT applications?

App Service
IoT Central
Azure IoT Hub
Data Lake Analytics

The correct answer is: Azure IoT Hub

The Azure IoT Hub is designed specifically to serve as a central message hub for Internet of Things (IoT) applications. It provides reliable and secure communication between IoT devices and the cloud. With the IoT Hub, developers can connect, monitor, and manage IoT devices at scale, allowing seamless interaction and data exchange between devices and applications. It offers features such as device-to-cloud telemetry data, cloud-to-device messaging, and built-in support for device management and provisioning, making it an essential component for building scalable IoT solutions. In contrast, while options like IoT Central provide a managed solution for building IoT applications, the IoT Hub is the foundational service that facilitates direct communication and management of devices. App Service primarily focuses on hosting applications and web services rather than handling IoT messaging. Data Lake Analytics, on the other hand, is targeted at big data processing and analytics, lacking the direct IoT communication capabilities that IoT Hub provides.