overview of OSI model layers:

7.Application-it is user friendly, what ever we are seeing on screen is application, internally it is converted to presentation, session, transport etc.. ex-Browser

6.Presentsation-it’s just a translation-translates data coming from application layer, name of unit exchange here is PPDU(Presentation protocol data unit)

5.Session-encryption and decryption of data, name of unit exchange here is SPDU(Session protocol data unit)

4.Transport-It is the Heart of the OSI model, it trasports data and name of unit exchange is TPDU(Transport protocol data unit)

3.Network-Data is in the form of (packets)

2.Datalink- It takes information from network and transports data to physical, everything is in the form of (frames)

  1. Physical-In physical layer everything is in the form of (bits).Finally when CPU is reading the data it is physical data, it converts bits to signals.

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Links and Joints
Links:

Links are used to connect different bodies and objects.It contains nodes where u going to join with other bodies or links based on the number of nodes they are classified as Binary,Ternary,Quaternary.

  • Binary link:This link has two nodes
  • Ternary link:This link has three nodes

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