Cisco OSPF Configuration Guide: Step-by-Step Tutorial
A complete single-area OSPF configuration on three Cisco routers, with every output block captured live from IOS XE 17.18: neighbors, routes, DR/BDR, ECMP, and the defaults worth changing.
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OSPF Packet Types Explained: Hello, DBD, LSR, LSU, LSAck
OSPF uses five packet types (Hello, DBD, LSR, LSU, LSAck) to discover neighbors and sync the LSDB. Here is what each one does and where it fits in the adjacency process.
OSPF vs. Other Routing Protocols: When to Use OSPF
OSPF vs EIGRP, RIP, BGP, and IS-IS: how they differ on convergence, scalability, vendor support, and metric logic, and when OSPF is actually the right choice.
Introduction to OSPF: How Link-State Routing Works
OSPF gives every router in an area an identical map and lets each compute its own shortest paths. How the LSDB, adjacencies, DR/BDR, cost, and areas actually fit together, with live captures.
Native VLAN Configuration and Security on Cisco Switches
Master native VLAN configuration on Cisco Catalyst switches, understand VLAN hopping attacks, and implement security best practices to protect your switched network.
Cisco 9800-CL Wireless Controller Setup Made Easy
Skip the Day 0 wizard and configure the Cisco Catalyst 9800CL via CLI, including management interface, trustpoint, AP join, GUI access, and bootstrap commands.
VTP Configuration on Cisco Switches: Versions 1, 2, and 3
VTP automates VLAN propagation across switches—but a single switch with a high revision number can wipe all VLANs from your network. Learn how to configure VTPv3, manage revision numbers, and avoid the most dangerous VLAN mistake.
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.
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.
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.
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.
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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.