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Implementing and Operating Cisco Security Core Technologies (SCOR) · Cisco
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C. The authentication and authorization requests are grouped in a single packet.
Correct answer is C, "In RADIUS, authentication and authorization are coupled together" https://www.cisco.com/c/en/us/support/docs/security-vpn/remote-authentication-dial-user-service-radius/12433-32.html You can find the answer in the "RADIUS Authentication and Authorization Sequence" diagram
RADIUS open standard protocol It uses UDP as a transmission protocol It uses UDP port number 1812 for authentication and authorization and 1813 for accounting. Authentication and Authorization are COMBINED in RADIUS. Only the password is encrypted while the other information such as username, accounting information, etc are not encrypted. No external authorization of commands is supported. No multiprotocol support. Used for network access