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A key operating condition is the required latency for the application, which varies considerably for file downloads, streaming, and interactive or conversational services. 2. The next three subsections examine important applications areas. 4. 5. 7 examines the important network protocols for media delivery of IP networks. 8. 9. 1 Classifying Operating Conditions for Media Applications over Broadband Networks A diverse range of different media applications as well as networks exists that have very different operating conditions or properties.

P2P systems have recently received considerable public attention for file sharing, such as illegal sharing of audio content. Popular P2P systems for file sharing include Napster, Gnutella, and Kazaa; these systems primarily differ in the methods used to locate which peer has the desired file. P2P systems generally have the following attributes: • • • • Peers discover one another (they are self-organizing). Peers generally have equal standing (peer equality) with symmetric communication between any two peers.

Speech vs. , some video packets are often more important than others). Unfortunately, QoS is currently not widely supported in packet-switched networks such as the Internet. The current Internet does not provide any QoS support, and it is often referred to as best effort (BE) because its basic function is to Copyright © 2005 by Taylor & Francis provide simple network connectivity by best-effort (without any guarantees) packet delivery. Different forms of network QoS under consideration for the Internet include differentiated services (DiffServ) and integrated services (IntServ).

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