VLAN

Master native VLAN configuration on Cisco Catalyst switches, understand VLAN hopping attacks, and implement security best practices to protect your switched network.

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.

Learn how to create VLANs, assign access ports, and verify your VLAN configuration on Cisco Catalyst 9000 series switches using IOS XE 17.x.

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.

Modern LANs run on high-speed switches, PoE, structured cabling, and Wi-Fi 6/7 APs. Here is a clean walkthrough of the components and how they fit together.

SVIs (Switch Virtual Interfaces) are logical VLAN interfaces that enable a Layer 3 switch to route between VLANs and provide management access. Master SVI creation, IP routing enablement, and troubleshooting SVI states.