Most people picture a router as the box between the LAN and the internet. Inside a real company network, routing does far more — connecting subnets, bounding broadcast domains, enforcing security zones, linking sites, and surviving failures. A tour of why internal routing exists.
Segmentation
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Routers Inside the Enterprise: What They Do Besides Reach the Internet -
Network Segmentation with VLANs: Isolating Traffic on Your Homelab and Beyond A practical guide to network segmentation using VLANs — how they work, configuring managed switches, setting up VLANs on pfSense/OPNsense, isolating IoT devices, creating a DMZ, inter-VLAN routing, and Linux trunk configuration.