Q. Open System Interconnection Networking Model?
An open system is a model which allows any two different systems to communicate regardless of their underlying architecture. The function of OSI model is to open communication between different devices without requiring changes to the logic of underlying software and hardware.
OSI model isn't a protocol, it's a model for designing and understanding a network architecture that is inter- operable, flexible and robust. OSI model has a seven-layered architecture. These are:
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Application Layer
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Presentation Layer
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Session Layer
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Transport Layer
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Network Layer
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Datalink Layer
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Physical Layer
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Figure: OSI Model