RADIUS vs TACACS+: Which AAA Protocol Actually Wins?
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Most networks get breached not through the firewall — but through the access layer.
Rogue DHCP servers, ARP spoofing, and unauthorized switch ports are silent killers.
RADIUS and TACACS+ are the lock. Here's how to use them.
📌 In this video:
We break down the three core access layer threats every CCNA candidate must know:
unauthorized MAC addresses (countered with Port Security), rogue DHCP servers
(blocked by DHCP Snooping), and ARP spoofing attacks (stopped by Dynamic ARP
Inspection). We then cover the full AAA framework — Authentication, Authorization,
and Accounting — explaining why local credentials fail at scale across hundreds of
switches. Finally, we compare RADIUS vs TACACS+ side by side, walk through the
complete AAA authentication flow from login prompt to resource access, and show
how users are dynamically placed into VLANs based on their profile — or denied
entirely if unrecognized.
⏱️ Chapters:
0:00 — Hackers Are Already in Your Network
0:44 — What Is the Access Layer?
1:10 — Port Security: Filter Unauthorized MACs
1:25 — DHCP Snooping: Block Rogue DHCP Servers
1:44 — ARP Spoofing Explained
2:18 — Dynamic ARP Inspection (DAI)
2:34 — Why Local Auth Fails at Scale
3:31 — AAA: Authentication, Authorization & Accounting
4:44 — RADIUS Protocol Explained
5:08 — TACACS+ Protocol Explained
5:30 — Full AAA Authentication Flow Step by Step
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#CCNA #NetworkSecurity #RADIUS #TACACS #CyberSecurity