A student is learning about authentication protocols and how they are used to communicate with AAA servers. Which statement describes a characteristic of such protocols?
- TACACS+ is a standard mostly Cisco equipment support, while RADIUS is an open standard.
- TACACS+ combines authentication and authorization, while RADIUS separates AAA according to the AAA architecture.
- RADIUS is considered the more secure protocol because all RADIUS protocol exchanges are encrypted.
- RADIUS uses a bidirectional challenge and response (CHAP), while TACACS+ uses a unidirectional challenge.
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