Data Transmission in OSI Model

Hello friends, in the previous post we have seen the detail architecture of OSI reference model, now we will see how data can be transmitted in the OSI model. Following fig. shows an example of data transmission in OSI model.

data transmission in OSI reference model

Fig. An example of how the OSI model is used.

The sending process has some data to send the receiving process. It gives the data to the application layer, which then attaches the application header, AH (Which may be null), and gives the resulting item to the presentation layer.

The presentation layer may transform this item in various ways and possibly add a header to the front, and send to the session layer.

This process is repeated until the data reach the physical layer, where they are actually transmitted to the receiving machine.

On that machine the various headers are stripped off one by one as the message propagates up the layers until it finally arrives at the receiving process.

The key idea throughout is that the actual data transmission is vertically not in horizontal manner i.e. not direct transmission takes place through transport layer of source machine to transport layer of destination machine.

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