Authentication, authorization, certificates and access control protocols

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Explain authentication, authorization and accounting (AAA) concepts and compare centralized access-control systems such as RADIUS and TACACS+.
Differentiate authentication factors and methods, including single-factor authentication, multifactor authentication, single sign-on and certificate-based authentication.

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Interpret digital certificate concepts, including public key infrastructure, certificate authorities, certificate signing requests, certificate chains, revocation and common certificate uses on network devices and services.

Compare network access-control and authentication protocols such as 802.1X, EAP methods and captive portal access, and determine where each is appropriate.

Apply authorization principles by selecting role-based, rule-based or attribute-based access approaches that enforce least privilege and secure administrative access.

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