Skip to main content

TCP/IP Protocol Suite


A protocol is a set of rules that allows effective communication

The TCP/IP protocol suite (a.k.a. Internet Protocol Suite) is a collection of protocols that collectively provides the data transport services used on the Internet. They provide a robust and efficient mechanism for moving data between machines across computer networks.

The suite is split into five layers

TCP/IP Five Layer Model

  • Application Layer - interfaces between application processes and transport layer services on host computer.
  • Transport Layer - determines how to use the network layer to provide a virtual point-to-point connection between source and destination.
  • Network/Internet Layer - layer by which data packets are routed from source to destination.
  • Data Link Layer - provides data transfer control across the physical layer
  • Physical Layer - the actual physical medium used for the transfer (e.g. cables, Infra red and microwave)

Next: TCP/IP Protocols