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The current demand for applications involving transfer of multimedia and real time events has resulted in additional protocols for the Internet currently under development as the Integrated Services model
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RSVP - Reservation Protocol - a virtual circuit is established that can reserve a certain bandwidth for continuous transmission of packets.
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Quality of service
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Multicasting
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RTP and RTSP - Real Time Protocol and, more specificately, Real Time Streaming Protocol - for continuous multimedia transmission
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These protocols require network hosts which support them to save state regarding the virtual circuits.
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