Episode 87: Layer 3 Switches — When a Switch Becomes a Router
Layer 3 switches bridge the gap between switching and routing by combining the frame forwarding capability of Layer 2 devices with the IP-based decision-making of routers. In this episode, we explain how Layer 3 switches perform inter-VLAN routing using switch virtual interfaces (SVIs) and how they support static and dynamic routing protocols. You’ll learn how they differ from traditional routers, when to use them, and how their performance advantages make them ideal for high-speed core or distribution layers.
We also discuss routing table configuration, SVIs, ACLs, and how Layer 3 switches handle broadcast traffic and packet forwarding. Whether you're working in a small office or a large data center, understanding these devices allows you to reduce bottlenecks and improve network scalability. If you're asked on the exam to choose a device that routes at high speed without the overhead of a router, the Layer 3 switch is the answer—and this episode shows you why.
