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Hey I am Ashish and I’m gonna tell you About ISO model and what it’s need..

By Ashish

When two computers talk to each other, they need to speak the same language. The structure of this language is described in layers by the OSI model.
The OSI model provides standards that allow hardware, such as routers and
firewalls, to focus on one particular aspect of communication that applies to
them and ignore others. The OSI model is broken down into conceptual
layers of communication. This way, routing and firewall hardware can focus
on passing data at the lower layers, ignoring the higher layers of data encapsulation used by running applications. The seven OSI layers are as follows:–

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Physical layer

This layer deals with the physical connection between
two points. This is the lowest layer, whose primary role is communicating
raw bit streams. This layer is also responsible for activating, maintaining,
and deactivating these bit-stream communications.

Data Link Layer

This layer deals with actually transferring data between
two points. In contrast with the physical layer, which takes care of sending the raw bits, this layer provides high-level functions, such as error
correction and flow control. This layer also provides procedures for activating, maintaining, and deactivating data-link connections.

Network layer

This layer works as a middle ground; its primary role is
to pass information between the lower and the higher layers. It provides
addressing and routing.

Transport layer

This layer provides transparent transfer of data between
systems. By providing reliable data communication, this layer allows the
higher layers to never worry about reliability or cost-effectiveness of data
transmission

Presentation layer

This layer is responsible for presenting the data to
applications in a syntax or language they understand. This allows for
things like encryption and data compression.

Application layer

This layer is concerned with keeping track of the
requirements of the application.

Session layer

This layer is responsible for establishing and maintaining
connections between network applications.

Thankyou

Ashish