A company wants to implement a solution that allows employees to log in once with their network credentials and then seamlessly access the email server, internal web apps, and file shares without being asked for the username and password again. Which network service role residing on a server is designed to centralize this authentication as well as authorization and accounting functions?
The correct answer is Authentication, Authorization, and Accounting (AAA). An AAA server-often implemented with RADIUS or TACACS+-acts as a centralized point that validates a user's credentials (authentication), determines what the user can do (authorization), and records that activity (accounting). Because users authenticate once to the AAA server, the same token can be reused by other network services (mail, web, file shares), eliminating the need to re-enter credentials. DHCP only distributes IP configuration information, DNS resolves hostnames to IP addresses, and NFS enables network file sharing; none of these provide centralized login or single-sign-on functionality.
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CompTIA A+ 220-1101 (V14)
Networking
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