OSI Layer Refrence Model with required computer protocol concept

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  Why ISO launched OSI reference model ?

When networks first came in to being, computers could typically communicate only with computers from the same manufacturer. To eradicate this problem , International Organization for Standarization (ISO) created a reference model named as Open System Interconnection (OSI) in 1970.

The purpose of OSI model was to help vendors create compatible network devices and software in the form of protocols so that different vendor networks could work with each other.

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  The advantages of OSI model-

Data transferring can be done between two diffferent hosts like in between unix and window pc.

It allows various types of network hardware and software to communicate.

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  What is OSI in real ?

OSI is a set of guidelines which provides a framework while creating and implementing networking standards , devices and schemes.

OSI has 7 different layers, divided in to two group. The top three layers define how the application will communicate with each other and with users. The bottom four layers defines how data is transmitted end to end.

The OSI model is a basic and primary architectural model for networks. It describes how data and network information are communicate from an application on one computer through the network media to an application on another computer.  

7 layers of OSI model

• The 7 layers of OSI refrence model

Application Layer
Presentation Layer
Session Layer

Transport Layer
Network Layer
Data Link Layer
Physical Layer