The NIC operates on Layer 2 (Data Link Layer) of the OSI Model.
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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.
From lowest to highest physical, data, transport, sessions, presentation, application.
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.
Application gateway/proxy
layer 4 - transport layer