OSI Reference Model

The International Organization for Standardization (ISO) developed a seven layer model called Open Systems Interconnection (OSI)Reference Model to help vendors and network experts to learn how data is transferred between networking devices. OSI Reference Model helps networking device manufactures to implement new network standards and policies. OSI Reference Model helps network administrators to reduce the complexity of networks and makes it easy to troubleshoot networking issues.


Seven Layers of OSI Reference Model

There are seven layers in OSI Reference Model and each layer has specific role in data communication. Seven layers of OSI reference model are listed below.

  1. Physical layer

  2. Data link layer

  3. Network layer

  4. Transport layer

  5. Session layer

  6. Presentation layer

  7. Application layer


What is The Need of OSI Reference Model

Prior to the introduction of Open System Interconnection (OSI) Reference Model, each vendors have their own manufacturing standards. It forced the user to stuck with single vendor for all his/her networking needs because devices from different vendors were not compatible. To overcome this issue International Organization for Standardization (ISO) introduced the seven layer OSI architecture. OSI Reference Model tells how to connect two layers in networks and helped vendors to make products in universal standards.

Benefits of OSI Reference Model

The major benefits of OSI Reference Model in a computer network are listed below.
  1. OSI Reference Model promotes interoperability between vendors by defining the process of connecting two layers.

  2. By dividing a network in to layers, we split complex network activities in to a set of simple components.

  3. Helps vendors to follow modular design

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