1. Delve into the technical aspects of system security controls, specifically local accounts and groups in Windows and Linux, as well as roles and permissions in those systems. Discuss the intricacies of managing and securing local accounts and groups across a large-scale enterprise environment. Share insights into best practices for setting up role-based access control (RBAC) and implementing the principle of least privilege in various system configurations. Furthermore, explore the challenges and considerations in maintaining a consistent and secure system access control framework while allowing flexibility for legitimate user needs.