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MPLS and Next-Generation Networks: Foundations for NGN and Enterprise Virtualization by Azhar Sayeed, Monique Morrow

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Chapter 9. Quality of Service

Quality of service (QoS) is an important aspect of any IP service offering. QoS helps define an important component of the service level agreement (SLA): packet delivery. The guaranteed and timely delivery of packets is necessary for applications, such as voice and video. The unsatisfactory delivery of packets results in an undesired user experience that might eventually result in a negative perception of the network. The existing user experience of the Internet has defined a grade of service called best effort. This Internet grade of service is usually assumed to be best effort packet delivery with no security or bandwidth guarantees but providing ubiquitous presence. Packets are delivered to the destination if they ...

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