Network Architectures and Protocols:
Earlier computer networks were designed with the hardware as the main concern, the software being considered secondary. But today, both are considered equally important. Network software in the present scenario has become highly structured. Let us take a detailed look at some of the software structuring techniques.
It is essential for the hardware, software, and communication channels to have defined standards for the interfaces between them.
Earlier, due to the absence of these standards, it was quite common to find that there was a lack of compatibility in data communication between the hardware and software of different manufacturers. This hampered the use of data communications, increased its costs, and reduced its efficiency and effectiveness. To support the development of advanced data communication networks, computer manufacturers and international organizations developed standards called protocols and network architectures. A protocol can be defined as a standard set of rules and procedures for the control of communications in a network.
The two important network architectures are the Open Systems Interconnection (OSI) reference model and the Transmission Control Protocol/Internet Protocol (TCP/IP) reference model.
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