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Deploying QoS for Cisco IP and Next Generation Networks by Brett Chapman, Vinod Joseph

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Chapter 1

The Evolution of Communication Systems

From the traditional telecommunications point of view, the network is a way to link two end devices from different locations for short periods of time. Network users generally pay for access to the telecom network as well as paying per-connection charges.

Contrast this scenario with the traditional data networking ideology, whereby the media are shared by groups of people all working at the same time. Data represented the important aspect of the system; the network was merely a resource allowing users to execute applications, such as browsing Websites, sending email, printing documents, and transferring files. Whether it took 2 seconds or 20 for the transfer of data was not the issue in general; ...

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