Configuring VLANs on Cisco Catalyst Switches
Learn how to create VLANs, assign access ports, and verify your VLAN configuration on Cisco Catalyst 9000 series switches using IOS XE 17.x.
6 min read
Blog
Cisco Modeling Labs CML 2.8 is Now Free
Cisco Modeling Labs 2.8 is now free, with a tier that lets you run routers, switches, and firewalls on your laptop. Here is what it unlocks for lab work and certs.
4 min read
Exploring Cisco Modeling Labs (CML) 2.8: What’s New in This Exciting Release
CML 2.8 brings a free tier, new images, and updated tooling for network simulation. Here is what is new, who benefits, and how to get the most out of the release.
3 min read
Understanding Collision Domains
A collision domain is any segment where two devices can step on each other's frames. Here is what shrinks them, why switches help, and how it affects performance.
2 min read
Cisco ASA Cheat Sheet: Essential Commands for Network Administrators
A working Cisco ASA cheat sheet: show version, write memory, failover, ACLs, NAT, and the troubleshooting commands you actually reach for under pressure.
2 min read
What is OSPF? A Complete Guide to Open Shortest Path First Protocol
OSPF is a link-state routing protocol that builds an LSDB, runs Dijkstra, and converges fast. Here is what problem it solves, how it works, and where it fits.
5 min read