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Layers of the TCP/IP (Open System Interface) Model
Defining the Four Layers of the TCP/IP Model
Transmission Control Protocol (TCP) / Internet Protocol (IP)
Application Layer - Layer 4
Transport Layer - Layer 3
Internet Layer - Layer 2
Network Interface Layer - Layer 1
Diagram of the TCP/IP Model
The TCP/IP model does not exactly match the OSI model. There is no universal agreement regarding how to describe TCP/IP with a layered model but it is generally agreed that there are fewer levels than the seven layers of the OSI model.

The four layer structure of TCP/IP is built as information is passed down from applications to the physical network layer. When data is sent, each layer treats all of the information it receives from the layer above as data and adds control information to the front of that data. This control information is called a header, and the addition of a header is called encapsulation. When data is received, the opposite procedure takes place as each layer removes its header before passing the data to the layer above.
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