OSI Model
The Open Systems Interconnection Reference Model (OSI Model or OSI Reference Model for short) is a layered abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection initiative. It is also called the OSI seven layer model.
Purpose
The OSI model divides the functions of a protocol into a [...]

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In computing world, a protocol is a set of instructions or rules that governs communication between two networking devices. These could be two computers or other network devices. Protocols can be implemented both by hardware and software.
A protocol may be used to define the communication behavior while a standard may be used to define the [...]

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