Supposed you are the Chief Network Engineer of a certain Telco. Your company is planning for a big business expansion and it requires that your network authenticate users connecting using analog modems, Digital Subscriber Lines (DSL), wireless data services, and Virtual Private Networks (VPN) over a Frame Relay network. Which AAA protocol would you implement?
A. TACACS+
B. DIAMETER
C. Kerberos
D. RADIUS
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Current AAA servers communicate using the RADIUS protocol. As such, TIA specifications refer to AAA servers as RADIUS servers. However, future AAA servers are expected to use a successor protocol to RADIUS known as Diameter.
https://en.wikipedia.org/wiki/AAA_(computer_security)
D