Microsoft Certified: Azure IoT Developer Specialty (AZ-220) Practice Test

The correct port number for MQTT transport on IoT Edge devices is 8883. This port is specifically used for MQTT over TLS (Transport Layer Security), ensuring that the communication is secure. MQTT is a lightweight messaging protocol designed for IoT devices, and using it over port 8883 indicates that the connection is established in a secure manner, which is important for protecting the data being communicated between devices and the cloud.

Port 8883 is a widely recognized standard for secure MQTT connections, making it essential for developers working with Azure IoT and IoT Edge to configure their devices to use this port when secure communications are required. This helps maintain the integrity and confidentiality of the messages exchanged in IoT applications.