RADIUS

RADIUS provides centralized authentication/authorization for network access and AAA.

Updated: 2026-03-06

Definition

RADIUS is commonly used for network access authentication (Wi-Fi, VPN) and AAA.

It centralizes user authentication and can integrate with directory services.

Key points

Centralized AAA for access
Common for Wi-Fi/VPN auth
Supports accounting

Common mistakes

Weak shared secrets and no secure transport considerations.
No redundancy for the RADIUS server.

Related exams

Cisco CCNA (200-301)

Free CCNA 200-301 mini test. Continue in the app for offline packs and detailed explanations.

CompTIA Security+ (SY0-701)

Free Security+ SY0-701 mini test. Continue in the app for offline packs and detailed explanations.

CompTIA Network+ (N10-009)

Free Network+ N10-009 mini test. Continue in the app for offline packs and detailed explanations.

Related terms

Want to practice this in exam-style questions?

Use the mini tests on each exam page, then continue in the app for offline packs and detailed explanations.