The Open Systems Interconnection (OSI) model and the Transmission Control Protocol/Internet Protocol (TCP/IP) model are both conceptual frameworks that describe how data is transmitted over a network. However, they differ in their structure and purpose.
OSI Model
The OSI model is a seven-layer model that was developed by the International Organization for Standardization (ISO) in the 1980s. It is a reference model, which means that it is not a specification for any particular implementation. The OSI model is intended to be a general framework for understanding and designing communication systems.
TCP/IP Model
The TCP/IP model is a four-layer model that was developed by the U.S. Department of Defense in the 1970s. It is a de facto standard, which means that it is widely used but not formally standardized. The TCP/IP model is more practical than the OSI model, and it is the basis for most modern Internet communication.
Comparison of OSI and TCP/IP Models
The following table summarizes the key differences between the OSI and TCP/IP models:
| Layer | OSI Model | TCP/IP Model |
|---|---|---|
| Application | Application, Presentation, Session | Application |
| Transport | Transport | Transport |
| Network | Network | Internet |
| Data Link | Data Link | Network Access, Data Link |
| Physical | Physical | Physical |
As you can see, the TCP/IP model combines the Application, Presentation, and Session layers of the OSI model into a single layer. It also splits the Data Link layer of the OSI model into two layers: Network Access and Data Link.
Conclusion
The OSI and TCP/IP models are both important frameworks for understanding and designing communication systems. The OSI model is a more theoretical model, while the TCP/IP model is a more practical model. Both models can be used to map communication systems to each other, which allows systems that use different models to communicate with each other. Checkout for more tutorials at TutorialsWeb.com