Day -1 The OSI Models
What is it? The Open Systems Interconnection (OSI) Reference Model • A conceptual framework showing us how data moves throughout a network. • Developed by the International Organization for Standardization (ISO) in 1977. It’s Purpose: • Gives us a guide to understanding how networks operate. It’s only a reference model, so don’t get wrapped up in the details. • Wasn’t implemented in the real world, TCP/IP is. The OSI Model Stack The OSI Model breaks down the complex task of computer-to-computer network communications into seven layers. Upper Layers (Host Layers) • Handled by the host computer and performs application-specific functions, such as data formatting, encryption, and connection management. Lower Layers (Media Layers) • Provide network-specific functions, such as routing, addressing, and flow control. 1.Application Layer: It is responsible for providing an interface for the users to interact with appl...