The document provides an introduction to computer networks and network models. It discusses the following key points in 3 sentences:
Data communication involves the exchange of data between two devices via transmission mediums like wired or wireless connections. The five basic components of a data communication system are the message, sender, receiver, transmission medium, and protocols. Network models like OSI and TCP/IP reference models organize networks into layers, with each layer performing specified functions and following protocols to communicate between devices.
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