Which AWS service allows connection to an on-premises Active Directory?

AWS Directory Services is specifically designed to allow seamless integration with on-premises Active Directory environments. This service provides a managed Active Directory compatibility layer, enabling organizations to connect their AWS resources and applications to their existing on-premises AD infrastructure.

By using AWS Directory Services, you can set up AD connectors or even create fully managed directories that synchronize with your on-premises AD. This facilitates the ability to use existing user credentials and identities for AWS applications, streamlining user management and maintaining a consistent authentication experience across your on-premises and cloud environments.

Other services mentioned, such as AWS CloudTrail, AWS Config, and AWS IAM, serve different purposes in the AWS ecosystem. For example, CloudTrail is primarily used for logging and monitoring AWS account activity, Config focuses on resource inventory and compliance, and IAM is about managing user access and permissions within AWS itself. None of these functionalities directly enable the connection to an on-premises Active Directory, which underscores why AWS Directory Services is the correct choice for this specific requirement.