Authentication

Question 1

Radius

Answer 1

More common AAA protocol
Remote Authentication, Dial-in User Service
Wide platform support
Centralized for all users
Available on almost any OS

Question 2

TACACS

Answer 2

Terminal Access Controller Access-Control System
Remote authentication protocol
XTACACS (extended)
TACACS+ - most recent/popular version

Question 3

Kerberos

Answer 3

Network auth protocol
Authenticate once
Mutual auth- protected against MiM and replay attacks
Uses cryptographic SSO tickets

Question 4

LDAP

Answer 4

Protocol for reading/writing to network directories

X.500 spec written by ITU