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.
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.
Latest posts — page 6
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.
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.
Cisco ASA Multiple Context Mode
Multiple context mode turns a single Cisco ASA into a hypervisor for several virtual firewalls. Each context has its own configuration, interfaces, ACLs, NAT rules, routing table, and even its own administrators. The classic use cases are service providers (one
Cisco ASA Inspection Engines: MPF and Custom Maps
The Cisco ASA Modular Policy Framework (MPF) is the configuration model that decides which traffic gets which kind of treatment as it crosses the firewall. It is what binds inspection engines to specific traffic, what applies QoS or connection limits,
Cisco ASA Syslog Configuration and Logging Levels
Syslog is what turns the Cisco ASA from a black box into something you can troubleshoot, audit, and SIEM. The configuration is small (six lines for a sane production setup), but the message format and the severity model both have
Cisco ASA Management Plane Hardening
The management plane is where most ASA breaches happen, and most of those breaches are preventable with a handful of configuration steps that take an hour to apply. This article covers the production-ready hardening pass for a Cisco ASA:
Cisco ASA Static Routing and Default Route Configuration
Static routing on the Cisco ASA is the core of every routed-mode deployment. Default route to the ISP, internal static routes pointing at downstream Layer 3 switches, redundant routes with administrative distance to fail over to a backup link.
Cisco ASA Inside/Outside/DMZ Configuration Walkthrough
The classic Cisco ASA topology is three zones with three security levels: inside (your trusted users at level 100), outside (the internet at level 0), and a DMZ (your public-facing servers at level 50, somewhere in the middle). This
Cisco ASA Initial Setup from CLI
A fresh Cisco ASA out of the box is mostly empty. There is a default enable password, an unconfigured Management0/0 interface, and the cli setup wizard prompting you to answer hostname/timezone/firewall mode questions. Most engineers cancel the
Cisco ASA Object Groups: Network, Service, and Protocol
Object groups are the difference between an ACL you can read and one you cannot. Without them, an ACL that permits HTTP, HTTPS, and SSH from three jump-host source addresses to four DMZ servers takes 36 lines. With them,
Cisco ASA Interfaces, Subinterfaces, and VLAN Trunks
The interface configuration on a Cisco ASA looks superficially like an IOS router, but two things are different and both matter. First, every data interface needs a nameif and a security-level before it can pass traffic. Second, the ASA