Explain OSI model

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Explain OSI model?

Computer Science


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The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into abstraction layers. The original version of the model defined seven layers.

A layer serves the layer above it and is served by the layer below it. For example, a layer that provides error-free communications across a network provides the path needed by applications above it, while it calls the next lower layer to send and receive packets that comprise the contents of that path. Two instances at the same layer are visualized as connected by a horizontal connection in that layer.

The model is a product of the Open Systems Interconnection project at the International Organization for Standardization (ISO).

The seven Open Systems Interconnection layers are:
  • Layer 7: The application layer
  • Layer 6: The presentation layer
  • Layer 5: The session layer.
  • Layer 4: The transport layer.
  • Layer 3: The network layer.
  • Layer 2: The data-link layer.
  • Layer 1: The physical layer.

Answerd By:RSHAH12

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 This is called a model for open system interconnection and is normally called as OSI model. OSI model architecture consists of seven layers. 
It defines seven layers or levels in a complete communication system.This model is developed by "ISO".
The seven layers are:
1. Application Layer 2. Presentation Layer 3. Session Layer 4. Transport Layer 5. Network Layer 6. Datalink Layer 7. Physical Layer 

Answerd By:gayathriadari

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