Chapter 11. Quality of Service

In a standard IP network, all packets are processed identically, based on best effort. The network devices usually ignore the importance or criticality of the data that is passing through the network. This creates problems in deployments where time-sensitive traffic, such as voice and video packets, is delayed or dropped because the network devices do not prioritize it over other traffic. The feature of prioritizing some traffic over other traffic is known as quality of service (QoS).

Imagine a long-distance phone call that involved a satellite connection. ...

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