Describe the OSI reference model with its principles and merits. OR What is Open Systems Interconnect (OSI) reference model? What are the principles used in defining the OSI layers? OR What are the...

Describe the OSI reference model with its principles and merits.

OR

What is Open Systems Interconnect (OSI)

reference model? What are the principles used

in defining the OSI layers?

OR

What are the different layers in the OSI reference model? Explain the functionalities of each layer.