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Q: How many layers are there in the OSI networking model?
  • A. 13
  • B. 11
  • C. 9
  • D. 7
Correct Answer: Option D - The OSI model (Open Systems Interconnection Model) is a multilayer communication model. It was developed as an open system non-contact enterprise by default it divides the network structure into seven layers, in order from top to bottom application, presentation, session, transport, network, datalink and physical layer. Hence it is also called "Seven Layer Model".
D. The OSI model (Open Systems Interconnection Model) is a multilayer communication model. It was developed as an open system non-contact enterprise by default it divides the network structure into seven layers, in order from top to bottom application, presentation, session, transport, network, datalink and physical layer. Hence it is also called "Seven Layer Model".

Explanations:

The OSI model (Open Systems Interconnection Model) is a multilayer communication model. It was developed as an open system non-contact enterprise by default it divides the network structure into seven layers, in order from top to bottom application, presentation, session, transport, network, datalink and physical layer. Hence it is also called "Seven Layer Model".