AWS Technical Essentials 2025 – 400 Free Practice Questions to Pass the Exam

The model used by IAM (Identity and Access Management) to aggregate permissions and maintain a deny bias is based on the principle of least privilege. This principle emphasizes that users should only have the minimum level of access necessary to perform their job functions. By adhering to this model, IAM systems reduce the risk of unauthorized access and limit the potential damage from errors or malicious actions.

In this context, the deny bias means that if there are conflicting permissions, the more restrictive policy (usually a deny) takes precedence. This approach helps ensure that users cannot access resources unless they have explicitly been granted permission, reinforcing security within the system.

The other models mentioned, such as shared responsibility and most privileged, serve different purposes and do not focus explicitly on this permission aggregation and deny bias. Shared responsibility relates to the division of security responsibilities between the service provider and the user, while most privileged would allow broad access, which contradicts the fundamental principle of limiting permissions to enhance security.