Exam 300-730 topic 1 question 196 discussion

- **E. pre-share**: This is a method for pre-shared key (PSK) authentication, typically used for device authentication, not user authentication.

E. Pre-share (Pre-Shared Key) is not an AAA (Authentication, Authorization, and Accounting) method. Instead, it is a method for peer authentication in IKE (Internet Key Exchange), where both parties use a shared secret key to establish trust. AAA-based authentication methods, like EAP and RSA-SIG, involve user-based authentication with an external AAA server (such as RADIUS or TACACS+). Pre-share does not involve user authentication via AAA but is instead a static, manually configured key for authenticating VPN peers. That's why E is incorrect for AAA user authentication in an IKEv2 profile.