OSI vs TCP/IP Models

1. Introduction

The OSI (Open Systems Interconnection) Reference Model and the TCP/IP (Transmission Control Protocol/Internet Protocol) Model are two foundational frameworks for understanding network communication. The OSI model, developed by the International Organization for Standardization (ISO) in 1984, is a theoretical, seven-layer model designed to standardize and explain network functions. The TCP/IP model, developed in the 1970s by Vinton Cerf, Robert Kahn, and others, is a practical, four-layer model that forms the basis of the internet and modern networking.

This lecture note compares the OSI and TCP/IP models, focusing on their structure, functions, and use cases. It highlights their similarities, differences, strengths, and limitations, and explains how they map to each other to provide a comprehensive understanding of network architectures.