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The Internet's network-layer protocol, IP, provides a best-effort service. That is to say that the service makes
it best effort to move each datatgram from source to destination as quickly as possible. It does not make any promises
whatsoever about the extent of the end-to-end delay fro an individual packet, or about the extent of packet jitter and packet
loss within the packet stream. The lack of guarantees about delay and packet jitter poses significiant challenges to
the design of real-time multimedia applications.
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