Application layer is placed on the top of the Transport layer. Application LayerĪpplication layer is the top-most layer of four-layer TCP/IP model. The four layers of original TCP/IP model are Application Layer, Transport Layer, Internet Layer and Network Access Layer.įollowing image shows the original four layered TCP/IP model.ĭetailed explanation about different layers of original four layered TCP/IP model is given below. The original TCP/IP model had only four layers, but the updated TCP/IP model has five layers.
The TCP/IP model which we use today is slightly different from the original TCP/IP model. The OSI reference model has been very influential in the growth and development of TCP/IP standard, and that is why much OSI terminology is applied to TCP/IP. OSI is a seven-layered model, but the original TCP/IP is a four layered model. The TCP/IP model is not same as OSI model. Like OSI reference model, TCP/IP protocol suite also has a model.
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