Advantages of DiffServ
Under DiffServ, all the policing and classifying is done at the boundaries between DiffServ domains. This means that in the core of the Internet, routers are unhindered by the complexities of collecting payment or enforcing agreements. That is, in contrast to IntServ, DiffServ requires no advance setup, no reservation, and no time-consuming end-to-end negotiation for each flow.
Read more about this topic: Differentiated Services
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