Advantages and Disadvantages of the OSI Model

Computer NetworkComputer EngineeringMCA

The advantages of the OSI model are

  • It is a generic model and acts as a guidance tool to develop any network model.
  • It is a layered model. Changes are one layer do not affect other layers, provided that the interfaces between the layers do not change drastically.
  • It distinctly separates services, interfaces, and protocols. Hence, it is flexible in nature. Protocols in each layer can be replaced very conveniently depending upon the nature of the network.
  • It supports both connection-oriented services and connectionless services.

The disadvantages of the OSI model are

  • It is purely a theoretical model that does not consider the availability of appropriate technology. This restricts its practical implementation.
  • The launching timing of this model was inappropriate. When OSI appeared, the TCP/IP protocols were already implemented. So, the companies were initially reluctant to use it.
  • The OSI model is very complex. The initial implementation was cumbersome, slow and costly.
  • Though there are many layers, some of the layers like the session layer and presentation layer have very little functionality when practically deployed.
  • There is a duplication of services in various layers. Services like addressing, flow control and error control are offered by multiple layers.
  • The standards of OSI model are theoretical and do not offer adequate solutions for practical network implementation.
  • After being launched, the OSI model did not meet the practical needs as well as the TCP/IP model. So it was labeled as inferior quality.
  • TCP/IP model was very much preferred by the academia. It was believed that OSI was a product of the European communities and the US government, who were trying to force an inferior model to researchers and programmers. Hence, there was considerable resistance in adopting it.
Published on 13-Jul-2018 17:10:39