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TCP/IP Model

A four-layer conceptual model used for the internet and similar networks, focusing on the protocols that enable communication.

Categorynetwork

Overview

The TCP/IP model (also known as the Internet Protocol Suite) is the practical implementation of networking used today. It predates the OSI model and is more streamlined.

The Four Layers

  1. Network Access Layer: Combines OSI layers 1 and 2 (Physical and Data Link).
  2. Internet Layer: Corresponds to OSI layer 3 (Network). Uses IP.
  3. Transport Layer: Corresponds to OSI layer 4. Uses TCP and UDP.
  4. Application Layer: Combines OSI layers 5, 6, and 7.

Comparison with OSI

While the OSI model is a theoretical standard, the TCP/IP model is the actual set of protocols that run the internet. Most modern networking discussions use a hybrid 5-layer model that combines the best of both.

Related Terms

OSI ModelTCPIP Address