Fundamentals

Networking fundamentals and CCNA-level reference content. The TCP/IP and OSI models, ethernet basics, encapsulation, IPv4 addressing, layer 2 fundamentals, and the Cisco IOS commands every network engineer reaches for. The foundations beneath the pillar guides.

76 posts

802.1X

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.

May 19, 2026 4 min read

802.1X

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.

May 18, 2026 5 min read

OSPF

OSPF vs BGP Redistribution: Which Protocol Wins Which Tie

When OSPF and BGP both know about the same prefix, who wins? A practical walkthrough of mutual redistribution, the admin-distance trap, and why BGP into OSPF needs a filter or it takes down your domain.

May 18, 2026 5 min read