CCT Lab Environment
RADIUS Authentication (AAA) Simulation
Lorenzo is tasked with implementing centralized authentication, authorization, and accounting (AAA) for remote-access servers. He deploys a protocol based on a client-server model that operates at the transport layer.
Network Topology
Remote Authentication System
👤
User
Client
→
🖧
Remote Access Server
NAS
→
🛡️
RADIUS Server
AAA
1User attempts login
2Credentials sent to authentication server
3Server validates credentials
4Access granted
5Activity logged
✔ Authentication
✔ Authorization
✔ Accounting
Centralized AAA service in action
Knowledge Base
Mini Lesson
Definition
RADIUS (Remote Authentication Dial-In User Service) is a protocol used for centralized authentication, authorization, and accounting.
How It Works
A client device sends user credentials to a RADIUS server, which verifies identity and returns access decisions.
Why It Matters
It centralizes access control, improves security, and simplifies user management.
Real-World Example
A company using RADIUS to authenticate employees connecting via VPN.
Key Takeaway
RADIUS enables centralized and secure access management using AAA principles.