What isOSI layers

Have you ever wondered how different devices on a network communicate with each other? It’s all made possible by the OSI (Open Systems Interconnection) model which defines networking protocols and standards. The OSI model consists of seven layers, each with its own specific function.

What are the 7 OSI Layers?

The seven OSI layers are:

  • Physical Layer
  • Data Link Layer
  • Network Layer
  • Transport Layer
  • Session Layer
  • Presentation Layer
  • Application Layer

What do each of the layers do?

The Physical Layer deals with the transmission of raw data over the communication channel, the Data-Link Layer provides error-free transfer of data frames between two network nodes, the Network Layer handles the transmission of data packets across different networks, the Transport Layer provides end-to-end reliable transport services, the Session Layer manages the connections and dialogues between different processes, the Presentation Layer is responsible for data translation, encryption and decryption, and the Application Layer is the user interface which provides accessibility to network services.

Why are the OSI Layers important?

The OSI model is an essential tool for network engineers, as it provides a universal language for discussing network architecture and functionality, enabling better communication and interconnectivity between different networking devices and vendors.


  • What is OSI model? – It is a conceptual model that defines the standards and protocols used for communication between different devices on a network.
  • How many layers are there in the OSI model? – There are seven layers in the OSI model.
  • What is the importance of the OSI model? – The OSI model provides a common framework for understanding and designing network architecture, enabling seamless communication between different devices and vendors.

Understanding OSI layers is crucial for anyone working with computer networks. By knowing the purpose of each layer, network architects and engineers can design more efficient and reliable communication systems.

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