The TCP/IP model developed in 1970s by DARPA an agency of US department of defense. Which describes a set of general steps and protocols to be used for communicating with each other over the network.
- Designed to communicate across the globe.
- Consists of four separate but related layers.
- Each layer performs specific functions and then passes result to another layer.
- Each layer defines the process of moving information across a network.
- Request of data moves from the top application layer to the bottom link layer and reverse happens at the receiving end.
- Uses - whatever you do on the internet like browsing, chatting, mailing, online games and other lots of services are handled by the TCP/IP.
Following diagram describes the flow of data, layers and data unit.
- 1. Link Layer
- 2. Internet Layer
- 3. Transport Layer
- 4. Application Layer
A detail of each layer is explained in further points of this chapter.
Before getting starting with TCP/IP, I suggest you to start from OSI model, if you dont know about the OSI model since its the basic.