CCNA Security IINS Exam Topics | 2.2.a Describe RADIUS and TACACS+

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Authentication, authorization, and accounting (AAA) is a term for a framework for intelligently controlling access to computer resources, enforcing policies, auditing usage, and providing the information necessary to bill for services.

These combined processes are considered important for effective network management and security.

Authentication: Identifies a user before access is allowed Define a list of authentication methods used: Must be applied to interface.

Authorization: Describes what a user is allowed to perform Defines list of authorization methods used: Must be applied to interface.

Accounting: Tracks the services and amount of resources used. Defines list of accounting methods used: Must be applied to interface.


Terminal Access Controller Access-Control System Plus (TACACS+) is a protocol developed by Cisco and released as an open standard beginning in 1993. Although derived from TACACS, TACACS+ is a separate protocol that handles authentication, authorization, and accounting (AAA) services. TACACS+ and other flexible AAA protocols have largely replaced their predecessors.

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