Authentication, Authorization, and Accounting (AAA) Servers

Question 1

RADIUS Server

Answer 1

The RADIUS server is UDP-based, and it authenticates servers such as Virtual Private Network (VPN) servers, Remote Access Services (RAS) servers, and the 802.1x authenticating switch.

Question 2

RADIUS Clients

Answer 2

RADIUS Clients are VPN servers, RAS servers, and the 802.1x authentication switch. Every RADIUS Client needs the secret key that is sometimes known as the session key or shared secret to join the RADIUS environment. RADIUS authentication communicates over the UDP port 1812. RADIUS accounting uses UDP Port 1813.

Question 3

Diameter

Answer 3

Diameter is the more modern version of RADIUS that works on TCP. Diameter is the AAA server that uses the EAP.

Question 4

TACACS+

Answer 4

This is the CISCO AAA server that used TCP, and uses TCP port 49 for authentication.