RBAC and Least Privilege Explained: What Is a Tier 3 Admin Account and How to Manage IT Team RBAC?

In this video, we’ll explore the fundamentals of RBAC (Role-Based Access Control) and the Principle of Least Privilege, and explain how these concepts can be applied to manage an IT team securely. We’ll look at how to manage RBAC and group memberships, how administrative access should be separated, and why IT administrators may need different accounts for different levels of access. We’ll also explain administrative tiering and the purpose of separate accounts for daily work, workstation administration, server administration, and Active Directory administration. In the model discussed in this video, Tier 0 is used for identity and Active Directory infrastructure such as Domain Controllers, Tier 1 is used for servers and server applications such as File, DNS, DHCP, and SQL servers, Tier 2 is used for workstation administration, and Tier 3 is used for normal user login and access to domain-joined PCs and everyday business resources. We’ll explain why an IT administrator should not use the same account for normal daily activities and privileged administration, and why separate accounts help reduce security risks and limit the impact of compromised credentials. We’ll also cover how to manage IT team group memberships using RBAC and the Principle of Least Privilege, ensuring that each administrator receives only the permissions required for their role. Finally, we’ll discuss why an IT administrator may use four separate accounts: a normal Tier 3 user account, a Tier 2 workstation administration account, a Tier 1 server administration account, and a Tier 0 Active Directory and Domain Controller administration account. The goal of this video is to provide a practical understanding of RBAC, least privilege, administrative tiering, account separation, and secure group membership management in an Active Directory environment.