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Routers operate in layer 3 because they must use the logical network address to determine which network to route the packet to. Logical addressing is a feature of layer 3, therefore a router is a layer 3 device.

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13y ago
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13y ago

Because Routers work on Layer 3 of the OSI model, the networking layer. The networking layer routes by IP address as opposed to a Layer 2 switch which routes frames by MAC addresses.

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10y ago

A Layer 3 switch can act as a router.

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Q: Why do you call router as layer three device?
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