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What is Network Architecture? What are the popular Network Architectures?

When two or more computer are connected with one another for the purpose of communicating data electronically, besides physical connection of computers, communication devices and system servers, a well defined standard known as architecture is required to establish cohesive communication between devices in Network.

The most popular architectures are:

  a. ISO Open System Architecture (OSI)
  b. IBM's System Network Architecture (SNA)