TCP/IP is a network protocol which is used on LANs, WANs and the Internet.
TCP/IP stands for Transmission Control Protocol / Internet Protocol. If this leads you to think that it is not just one protocol, you're right. In fact, it is not just two protocols, either. TCP/IP is a suite of protocols.
Like most network protocols, TCP/IP is a layered protocol. Each layer builds upon the layer below it, adding new functionality. The lowest level protocol is concerned purely with the business of sending and receiving raw data using specific network hardware. At the top are protocols designed specifically for tasks like transferring files or delivering email.
In between are levels concerned with things like routing and reliability. The benefit that the layered protocol stack gives you is that if you invent a new network application or a new type of hardware, you only need to create a protocol for that application or that hardware: you don't have to rewrite the whole stack.
* Application layer : FTP;SMTP;SNMP
* Transport Layer : TCP, UDP
* Network Layer : IP
* Link Layer : IEE802.x; PPP
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