Which AWS service supports device connections utilizing the MQTT protocol?

AWS IoT Core is the correct answer because it is specifically designed to facilitate secure communications between internet-connected devices and the AWS Cloud. One of the key protocols supported by AWS IoT Core is MQTT (Message Queuing Telemetry Transport), which is a lightweight messaging protocol ideal for IoT devices that require efficient data transmission with minimal overhead.

MQTT is particularly suitable for scenarios where devices have limited processing power and bandwidth. AWS IoT Core provides the necessary infrastructure for managing MQTT connections, enabling device authentication, message processing, and integration with other AWS services. This makes it a fundamental service in the development and deployment of IoT solutions on AWS.

In contrast, AWS Lambda is a compute service that lets you run code in response to events; however, it does not directly handle device communication using MQTT. AWS Device Manager serves to manage and monitor physical devices, but it does not support MQTT connections inherently. AWS CloudTrail is focused on logging and monitoring API calls made within the AWS infrastructure and is unrelated to device connectivity or protocol support for communication.