Describe TCP/IP four layers with a suitable figure
Answers
Four Layers of original TCP/IP model, Functions of four layers of TCP/IP model
Like OSI reference model, TCP/IP protocol suite also has a model. The TCP/IP model is not same as OSI model. OSI is a seven-layered model, but the original TCP/IP is a four layered 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. The TCP/IP model which we use today is slightly different from the original TCP/IP model. The original TCP/IP model had only four layers, but the updated TCP/IP model has five layers.
The four layers of original TCP/IP model are Application Layer, Transport Layer, Internet Layer and Network Access Layer.
Following image shows the original four layered TCP/IP model.
Detailed explanation about different layers of original four layered TCP/IP model is given below.
Layer 4. Application Layer
Application layer is the top most layer of four layer TCP/IP model. Application layer is placed on the top of the Transport layer. Application layer defines TCP/IP application protocols and how host programs interface with Transport layer services to use the network.