What is the fundamental distinction between a layer 2 switch and a router?

In the OSI model, switches belong to Layer 2 while Routers belong to Layer 3.

The fundamental distinction between a layer 2 switch and a router is that a Layer 2 switch belongs only to its local network, and a router belongs to two or more.

The switch filters and forwards packets between LAN segments, while the router forwards data packets along networks. It is connected to at least two networks.

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