OSI Model - Presentation Layer (Layer 6)

OSI Model – Presentation Layer (Layer 6)

In a Data Transfer process, after the Application Layer has done its done job of providing the application service, the data is then handed to the next layer which is known as the Presentation Layer.

What does it do?? Well, as the name suggests “Presentation”, it has something to do with the presentation of the data that came from the upper layer “Application Layer”.

Presentation Layer helps in presenting the data in correct format, it provides service of encryption, decryption, compression, decompression, capsulation, etc.

From the sending host side:

When a data is received by the presentation layer, it formats the data in correct format, so that it helps the layers below to help in the data transfer process. It also compress the data, to make the data size smaller so that the data is transferred easily (no one would like to carry a big packet with him for delivery), and provides encryption so that when a data is transferred, the layers below should not be able to see what the actual content is.

From the receiving host side:

When a data is received by the presentation layer, it just does the opposite of whatever services was provided by the presentation layer by the sending host to unpack the content for the application layer.

If compression was done, here it will be decompression.

If encryption was done, here it will be decryption, and so on..

From the sender side, after Presentation Layer has done its job, it will then hand the formatted data to the next layer which is the Session Layer.

User	Service
Application Layer	Web Browser, Email Clients
Presentation Layer	Formats data, compression, encryption, etc

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