AAA 802.1x Protocols(Radius & TACACS+)

AAA Server like Cisco ACS (Access Control Server) Servers uses 802.1x Protocols like RADIUS (Remote Authentication Dial-In User Service) / TACACS+ (Terminal Access Controller Access-Control System Plus) for authentication.

• Radius	TACACS+
  Open Standard Protocol	Cisco Proprietary Protocol
  Combines Authentication + Authorization	Separates Accounting, Authentication & Authorization
  uses UDP ports 1645 & 1812	uses TCP port 49
  Only password is encrypted	entire packet is encrypted
  used for Users	used for Networking devices
  Encrypts the password only	Encrypts the entire packet including the password
  	Centralize which users can issue commands on your devices in your Network

Reference:

• https://courses.davidbombal.com/courses/267624/lectures/4159176