This section of the Internet Tool Survey describes the quality of service provided by the Internet. Currently the Internet offers a point-to-point delivery service, which is based on the "best effort" delivery model. In this model, data will be delivered to its destination as soon as possible, but with no commitment as to bandwidth or latency. Using protocols such as TCP, the highest guarantee the network provides is reliable data delivery. This is adequate for traditional data applications like FTP and Telnet, but inadequate for applications requiring timeliness. For example, distributed multimedia applications need to communicate in real-time and are sensitive to the quality of service they receive from the network. For these applications to perform adequately and be widely used, QoS must be quantified and managed, and the Internet must be modified to support real-time QoS and controlled end-to-end delays. The notion of QoS must be extended from the communication layer up through the intervening architectural layers to the application level.
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