- RADIUS separates authentication and authorization whereas TACACS+ combines them as one process.
- RADIUS is supported by the Cisco Secure ACS software whereas TACACS+ is not.
- RADIUS uses TCP whereas TACACS+ uses UDP.
- RADIUS encrypts only the password whereas TACACS+ encrypts all communication.
Explanation: TACACS+ uses TCP, encrypts the entire packet (not just the password), and separates authentication and authorization into two distinct processes. Both protocols are supported by the Cisco Secure ACS software.
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