RADIUS primarily functions as a protocol that provides centralized Authentication, Authorization, and Accounting management for users who connect and use a network service. Authentication verifies who the user is, Authorization determines what a user can and cannot access, and Accounting keeps track of the consumption of network resources by the user. The other options, while plausible-sounding, are incorrect because they do not describe the main functionalities provided by RADIUS.
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What are Authentication, Authorization, and Accounting (AAA)?
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How does RADIUS differ from other authentication protocols?