FUNCTIONALITY OF TCP/IP LAYERS

As opposed to the seven layers of the OSI model, TCP/IP has only five. Table 3 shows the layers for the OSI model and TCP/IP.

Table 3. ISO-OSI LAYERS AND TCP/IP LAYERS
ISO-OSI Layers TCP/IP Layers
Application layer Application layer
Presentation layer Application layer
Session layer Application layer
Transport layer Transport layer (TCP/UDP)
Network layer Network layer (IP)
Data Link layer Data Link layer
Physical layer Physical layer

The Application layer in a TCP/IP network covers the upper three layers of the OSI model. Table 4 briefly explains the functionality of each TCP/IP layer.

Table 4. TCP/IP LAYER FUNCTIONALITY
Layer Description
Physical layer Handles Physical layer data in the form of segments. ...

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