OSI Model Explained | 7 Layer | CCNA | Computer Network

Understanding the 7 Layer OSI model is vital to anyone working in tech. The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes a telecommunications or computing system's communication operations, regardless of its underlying internal structure and technology. Its purpose is to ensure that different communication systems can communicate with each other using standard communication protocols.

From the practical implementation of transferring bits via a communications media to the highest-level representation of data in a distributed application, the model divides the flow of data in a communication system into seven abstraction levels. Each intermediary layer provides a class of functionality to the layer above it while also receiving service from the layer below. Standard communication protocols are used to implement classes of functionality in software.

Starting in the late 1970s, the OSI model was created to accommodate the growth of many computer networking systems that were competing for use in big national networking operations throughout the world. The model became a working product of the International Organization for Standardization's Open Systems Interconnection group in the 1980s (ISO). While intended to provide a full definition of networking, the model failed to gain traction among software architects in the early Internet's architecture, as evidenced by the less prescriptive Internet Protocol Suite, which is primarily sponsored by the Internet Engineering Task Force (IETF).

7. Application Layer
6. Presentation Layer
5. Session Layer
4. Transport Layer
3. Network Layer
2. Data Link Layer
1. Physical Layer

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//CHAPTERS:
Intro - 00:00
Layer 7 - Application - 00:13
Layer 6 - Presentation - 01:17
Layer 5 - Session - 02:03
Layer 4 - Transport - 03:03
Layer 3 - Network - 05:16
Layer 2 - Data Link - 06:44
Layer 1 - Physical - 09:31
Layer 8 - 10:18

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