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Concept Explainer · Enterprise IT & Networks

Switching vs. Routing — Why One Device Reads MAC Addresses and the Other Reads IP Addresses

A switch can move a frame anywhere inside its own subnet in microseconds. It cannot get that frame one hop past the subnet boundary — that job belongs to something else entirely.

"Switching" and "routing" get used almost interchangeably in casual conversation — both move traffic, both live in a network closet, both show up as boxes with a lot of blinking lights. But they are not two flavors of the same job. A switch operates at Layer 2 (the Data Link layer) and forwards frames using nothing but destination MAC addresses, entirely within a single broadcast domain. A router operates at Layer 3 (the Network layer) and forwards packets using destination IP addresses, specifically to get traffic from one subnet into a different one. Neither device can do the other's job. A switch has no concept of a subnet at all — it doesn't know what an IP address is. A router's entire reason for existing is to recognize that a destination lives outside the current subnet and forward it toward the right next hop.