After a model is chosen, and the techniques and technologies are in place, an organization must decide how they want to administer access. Centralized access control administration is that one individual (rather it be one person or department) has the role of giving access to all of the resources in the organization. A couple of protocols for this that the study guide outlines are listed below.
RADIUS - Remote Authentication Dial-in User Service. A network protocol that authenticates and authorizes on the client/server and keeps a watch on remote users. ISPs use this to allow customers access to the internet. Uses UDP as its transport protocol.
TACACS - Terminal Access Controller Access Control System. Uses TCP as its transport protocol. Used if more advanced authentication is necessary. One example would be corporate networks.
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