Скачать или смотреть What are TACACS+ RADIUS protocols? How to configure cisco packet tracer? CCNA Security new-2025

TACACS+ (Terminal Access Controller Access Control System) is an enhancement to TACACS developed by Cisco. Which means TACACS+ is Cisco's proprietary protocol. TACACS+ is mainly used for device administration using ACS (Access Control Server). TACACS+ is used for the communication between the client and the Cisco ACS server. TACACS+ is a reliable protocol because it uses TCP port 49 for communication and the TACACS+ communication is encrypted means all the packets is encrypted. TACACS+ provides more control over accounting and authorization. TACACS+ combines authentication and authorization in one step.

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Remote Access Dial-In User Service (RADIUS) is the IEFT standard protocol. The RADIUS protocol is used for communication between any vendor (cisco or non-cisco) AAA client and ACS server. If you are using multiple vendors devices then you can use RADIUS. In RADIUS communication is faster but a bit less reliable uses UDP port 1645/1812 for authentication and 1646/1813 for accounting. In a single process authentication and authorization can be done. RADIUS key with MD5 is used to hide the user password.


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