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In the early days of networking, designers used hubs to attach servers and workstations, and routers to segment the network into manageable pieces. Because of the high cost of router interfaces and the inherent limitations of shared-media hubs, network design was generally well done. In recent years, with the rise of switches to segment networks, designers could hide a number of faults in their networks and still get good performance. As a result, network design has suffered.
VoIP places new demands on the network that cannot be met by sub-optimal designs. Even with switches installed, designers must attend to industry best practices for a properly functioning voice network. Because users will not tolerate poor voice quality, administrators must implement a sound network before beginning VoIP pilots or deployments.
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