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Voice over IP Fundamentals, Second Edition by Sudipto Mukherjee, Satish Kalidindi, Manoj Bhatia, James Peters, Jonathan Davidson

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Chapter 8. Quality of Service

Quality of service (QoS) is an often-used and misused term that has a variety of meanings. In this book, QoS refers to both Integrated Services (IntServ) and Differentiated Services (DiffServ). Although the two mechanisms greatly differ, the basic goal of IntServ and DiffServ is to achieve the bandwidth and latency needed for a particular application.

DiffServ is typically used on large networks to classify the appropriate level of QoS a particular stream or group of traffic from an individual or corporation requires. This is done via setting the Type of Service (ToS) field or DiffServ Code Point (DSCP).

IntServ is typically used to ensure that the specific flow of traffic is going to receive the appropriate level of ...

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