This 70-part series covers everything a network engineer needs to understand—from how devices communicate to how automation is reshaping the field. Structured around CCNA 200-301 objectives, but built on open standards. No vendor lock-in required.
Your laptop knows one thing — the address of its default gateway. That gateway is a router, and every network you've ever used depends on at least one.
Most inter-VLAN routing in enterprise networks isn't done by a router. It's done by a switch that understands IP. This post breaks down how Layer 2 and Layer 3 switches differ, how SVIs and routed ports work, and why TCAM makes hardware-based routing possible.