If you're planning on taking the Security+ exam, you should understand access control models, including the role-BAC access control model.
For example, can you answer this sample Security+ question?
Q. Your organization wants to reduce the administrative workload related to account management. Which of the following is the BEST choice?
A. Implement group-based privileges.
B. Implement user-based privileges.
C. Implement the Guest account and Guests group.
D. Implement periodic reviews of user access.
See if you're correct by checking out the answer and explanation here.