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CCDE Quick Reference by Mosaddaq Turabi, Russ White

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Chapter 10. IP Quality of Service

Many IP networks today carry traffic from a wide range of applications requiring different levels of performance from the network for optimal operations. It is important that traffic from mission-critical applications be given priority over ordinary traffic, and at the same time delay and jitter be minimized for any time-sensitive multimedia and voice applications.

Quality of service (QoS) refers to the network’s capability to control resources and provide the appropriate level of service for selected traffic over various underlying technologies. Because of the convergence of voice, video and data, QoS is becoming an increasingly critical element in network design considerations and deployment of IP-based networks. ...

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