This paper reviews the two IP QoS architectures considered by the IETF, namely IntServ and DiffServ.
Today’s Internet applies best effort (BE) IP forwarding. The network attempts to deliver all traffic as soon as
possible within the limits of its abilities, but without any
guarantees related to throughput, delay, delay variation
and packet loss. It is left up to the end systems to cope
with network transport impairments.
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