Presentation layer

Presentation layer (layer 6) 

Hello Guys,

in this post we will discuss about presentation layer

 Presentation Layer is the 6th layer of OSI model its responsible for :-

1. Data Formation 
2. Data encryption
3. Data Compression

Let's we discuss about above mention point briefly  

DATA format

The presentation layer control the formatting and syntax of user data for the application layers this ensures that the data received from the network can be used by the application and information send by application.
Standards were developed for the formatting of data types such as text, images, audio, video
Example : -
TEXT =       asci, html
IMAGES =  GIF, jpg
AUDIO =     mp3, wave
VIDEO =     AVI, mp4, wmv

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Data Encryption

Presentation layer also responsible for Data encryption. there are below mention the type of encryption 

Encryption standard

DES   = 56 bits
3DES = 3 * 56 bits = 168 bits
AES   = 128 bits
          = 192 bits
           = 256 bits

Note: - Speed and security are inverted to each other

Data compression

While transmitting large amount of data Data compression is efficiently It reduces the number of bits contained in the information.