Which service provides secure, bi-directional communication for Internet-connected devices to connect to the AWS Cloud over MQTT, HTTPS, and LoRaWAN?

• A. AWS Outposts
• B. AWS IoT
• C. Internet of Things (IoT)
• D. Amazon ECR

Answer: (B)

The main idea is secure, bidirectional connectivity for Internet-connected devices into the AWS Cloud using common IoT protocols. The AWS IoT service is built exactly for this. It provides a managed, secure message broker that supports MQTT and MQTT over WebSockets, HTTPS for device interactions, and it extends to LoRaWAN through AWS IoT Core for LoRaWAN, letting LoRaWAN devices connect to AWS as well. It handles device identity and authentication (for example, X.509 certificates with mutual TLS), fine-grained access control, and message routing into other AWS services via a rules engine, as well as device shadows to keep device state in the cloud. This makes AWS IoT the best fit for secure, bi-directional connectivity with the listed protocols. The other options don’t fit: Outposts is about extending AWS to on-prem environments, a generic IoT term isn’t a service, and ECR is a container registry.