No, that is not true D not good answer - RADIUS and TACACS+ both combine authentication and authorization. However, TACACS+ also provides the ability to perform network access control (NAC). NAC is a security feature that allows network administrators to control which devices are allowed to connect to the network and what resources they are allowed to access.
RADIUS is a network protocol that provides authentication, authorization, and accounting (AAA) services for remote access. It is an open standard protocol, which means that it can be implemented by any vendor. RADIUS is used by a wide variety of devices, including routers, switches, firewalls, and access points.
TACACS+ is a network protocol that provides AAA services for network devices. It is a Cisco proprietary protocol, which means that it can only be implemented by Cisco. TACACS+ is used by Cisco devices, but it is not as widely used as RADIUS.
Authentication and Authorization
RADIUS combines authentication and authorization. The access-accept packets sent by the RADIUS server to the client contain authorization information. This makes it difficult to decouple authentication and authorization.
TACACS+ uses the AAA architecture, which separates AAA. This allows separate authentication solutions that can still use TACACS+ for authorization and accounting.
https://www.cisco.com/c/en/us/support/docs/security-vpn/remote-authentication-dial-user-service-radius/13838-10.html#anc0
https://en.wikipedia.org/wiki/TACACS
D. Extended TACACS (XTACACS) extends the TACACS protocol with additional functionality. It also separates the authentication, authorization, and accounting (AAA) functions out into separate processes, allowing them to be handled by separate servers and technologies.[5]
E. TACACS is defined in RFC 8907 (older RFC 1492), and uses (either TCP or UDP) port 49 by default.
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