When saying (end-to-end QoS) in network, what do we really mean by that?

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QoS is a very large and complex subject that encompasses everything from classifying and marking packets, to performing some sort of action (shaping, policing, queuing, etc.) based on the classification/marking.

End-to-end QoS involves classifying and marking packets at the source and having comprehensive and consistent QoS policies of how the various classifications/markings are treated from the packet source to the packet destination.

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