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Computer Networking- CCNA part 12 of Segment 1- Session Layer of OSI Model

Session Layer 

OSI Model's fifth layer is session  layer. This layer handles the issues which are related to software.  Session layer maintain session from the user connected to terminate connection. (User ke internet se connect hone se lekar disconnect hone ke bich ke sare session establish and terminate karne ka kaam session layer karti he)some important functions are performed by this layer are follows;

  • Establishing connection.
  • Maintaining connections
  • Synchronizing communication
  • Controlling dialogues
  • Terminating connections.


Session Layer is responsible for establishing , maintaining and terminating sessions between the end level users. These sessions are made by  request and responses among applications.

For example-  When we use web browser and logon to different websites so at that time many sessions are created for each websites. 
for more easy understanding  suppose at a time i am downloading any file so at that time i would being used FTP protocol,  so my one session would be created with FTP server  and if at the same time of downloading  if i am using different web sites  so many other sessions are created with servers of that websites.  These sessions are created , managed and terminated after completing of work or downloading file.

(Ise achhe se samjhne ke liye suppose kijiye  yadi me koi file download kar rha hu aur me FTP protocol ka use karuga so us time jo bhi session bana hoga wo FTP server ke sath bana hoga aur sath me hi me yadi sirf surfing kar rha hu alag alag web sites se  to me un websites ke sath alag alag session create honge, manage honge aur kaam pura hone ke baad automatically terminate ho jayege. )



Some services are provided by Session Layer;

Authentication -as we know session layer is related to applications so some times in web browsers and other web applications for authentication login username and password is required for creating session.

Permissions- it means  till which lever user can access the data from servers are managed by this service.

Session Restoration-  This service is for restore the session which is broken by technical or connection errors.
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