OSI Module 

To understand OSI Module you need to know some things that is 

OSI

ISO developed OSI  at the same time competing model known as TCP/IP which was promoted by difference .

    OSI Stand for Open System Interconnect & TCP stand for Transmission Control Protocol 

Their are 7 Layers in OSI as following :-

We start form last to first :-

7.Application

6.Presentation

5.Session

4.Transport

3.Network

2.Data Link

1.Physical

1.Physical

In this layer of OSI Actual data transfer happen the data in format of files

digits 0's,1's are flow in this layer.

 2.Data Link 

This layer have the capability to check Errors, In this layer data frame units included 

it is one of important layer Mac addressing is part of Data link layer on the local network.

3.Network 

Network layer have data unit packet in this data unit packet IP address information included 

this layer have one important feature in it self that it find the best path for communication.

4.Transport 

It is the one of the critical layer in this layer TCP which is reliable & UDP which is unreliable consepts are included ports .

5.Session 

It create and maintain  the session in network a lot of time we see this kind of error that the session is terminated  when internet connection has gone or by accidently we will get disconnect form the network.

6.Presentation 

Till 5th layer we are working in binary data that is 0's & 1's. In this layer the network convert this data in Presentation format like in English or Other language .

7.Application 

This layer is known as network aware application where visualize the data or network details....