IEEE 802.1X Authentication: The Standard Explained
"802.1X" gets used loosely to mean "the thing that makes you log in to the network.
4 min read
802.1X
Port-based network access control, the standard for authenticating users and devices onto wired and wireless networks. Articles tagged 802.1X cover supplicant and authenticator behavior, RADIUS, EAP methods, Cisco ISE, dynamic VLANs, dACLs, host modes, and phased deployment.
36 posts
Enable IEEE 802.1X Authentication on Windows 11 (Manual + Group Policy)
How to enable IEEE 802.1X on Windows 11 wired adapters. Start the Wired AutoConfig service, configure the Authentication tab, push the same settings via Group Policy.
4 min read
What is 802.1X Authentication? End-to-End Flow with Real show Output
How 802.1X authenticates a switch port from link-up to traffic flow. The three roles, EAPoL exchange, IOS XE config, host modes, and real show authentication sessions output.
5 min read
Cisco ISE 802.1x Wired Configuration: A Practical Step-by-Step Guide
A complete, copy-pasteable walkthrough of deploying wired 802.1x with Cisco ISE as the RADIUS server and a Catalyst switch as the authenticator — from Policy Sets to IBNS 2.0 CLI to show commands and Live Logs.
12 min read
How to Configure 802.1X and WPA3 Enterprise on the Cisco C9800
802.1X plus WPA3 Enterprise gives you mutual authentication, granular access, and protection against modern wireless attacks. A step-by-step Cisco Catalyst 9800 configuration guide for secure enterprise wireless.
10 min read
Understanding RADIUS in 802.1X Authentication
RADIUS is the glue between a Catalyst switch and Cisco ISE in 802.1X. Here is how the Access-Request carries EAP, why UDP 1812/1813 matters, and where failures surface.
9 min read