Network layer

In the seven-layer OSI model of computer networking, the network layer is layer 3. The network layer is responsible for packet forwarding including routing through intermediate routers.

"Layer 3" redirects here. For the MPEG-1 Audio format, see MP3. For the layer in the cerebral cortex, see Cerebral cortex § Layered_structure.
OSI model
by layer
7.  Application layer
6.  Presentation layer
5.  Session layer
4.  Transport layer
3.  Network layer
2.  Data link layer
1.  Physical layer
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