User Authentication Terms

Before performing system management tasks, become familiar with the terms defined in Table 8.

Table 8: System Management Terms

Term	Definition
Remote Authentication Dial-In User Service (RADIUS)	Authentication method for validating users who attempt to access one or more services routers by means of Telnet. RADIUS is a multivendor IETF standard whose features are more widely accepted than those of TACACS+ or other proprietary systems. All one-time-password system vendors support RADIUS.
Terminal Access Controller Access Control System Plus (TACACS+)	Authentication method for validating users who attempt to access one or more services routers by means of Telnet.