Router is a Layer 3 (Network Layer)device that checks packet's IP Address at input interface & routes them to interface connected to destination network if available.
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The NIC operates on Layer 2 (Data Link Layer) of the OSI Model.
layer 4 - transport layer
TCP/IP because the osi model has seven layer but in tcp/ip only four layers and most important is that the tcp/ip model is reduce the function of osi model.
The network layer. # Physical # Data Link # Network # Transport # Session # Presentation # Application
Data Link Layer