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6 Summary
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priority scheduling, round-robin scheduling, and weighted-fair queuing We then explored the leaky bucket as a policing mechanism, and showed how the leaky bucket and weighted-fair queuing can be combined to bound the maximum delay a packet experiences at the output queue of a router In Sections 67-69 we showed how these principles and mechanisms have led to the definitions of new standards for providing QoS in the Internet The first class of these standards is the so-called intserv standard, which includes two services -- the guaranteed QoS service and the controlled load service The guaranteed QoS service provides hard, mathematical provable guarantees on the delay of each of the individual packets in a flow The control-load service does not provide any hard guarantees, but instead ensures that most of an application's packets will pass through a seemingly uncongested Internet The intserv architecture requires a signaling protocol for reserving bandwidth and buffer resources within the network In Section 68 we examined in some detail an Internet signaling protocol for reservations, namely, RSVP We indicated that one of the drawbacks of RSVP (and hence the Intserv architecture) is the need for routers to maintain per-flow state, which may not scale We concluded the chapter in Section 69 by outlining a recent and promising proposal for providing QoS in the Internet, namely, the diffserv architecture The diffserv architecture does not require routers to maintain per-flow state; it instead classifies packets into a small number of aggregate classes, to which routers provide per-hop behavior The diffserv architecture is still in its infancy, but because the architecture requires relatively minor changes to the existing Internet protocols and infrastructure, it could be deployed relatively quickly Now that we have finished our study of multimedia networking, it is time to move on to another exciting topic in networking, namely, network security Recent advances in multimedia networking may displace the distribution of audio and video information to the Internet; as we shall see in the next chapter, recent advances in network security may displace the majority of economic transactions to the Internet
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Copyright 1996-2000 James F Kurose and Keith W Ross All Rights Reserved
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file:///D|/Downloads/Livros/computa o/Computer%20NetDown%20Approach%20Featuring%20the%20Internet/6sumhtm (2 of 2)20/11/2004 15:52:58
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Sections 61-62 1) What is meant by interactivity for streaming stored audio/video What is meant by interactivity for real-time interactive audio/video 2) Three "camps" were discussed for evolving the Internet so that it better supports multimedia applications Briefly summarize the views of each camp In which camp do you belong 3) Figures 62-2, 62-3 and 62-4 present three schemes for streaming stored media What are the advantages and disadvantages of each scheme Sections 63-64 4) What is the difference between end-to-end delay and delay jitter What are the causes of delay jitter 5) Why is a packet that is received after its scheduled playout time considered lost 6) Section 63 describes two FEC schemes Briefly summarize them Both schemes increase the transmission of the stream by adding overhead Does interleaving also increase the transmission rate 7) How are different RTP streams in different sessions identified by a receiver How are different streams from within the same session identified How are RTP and RTPC packets (as part of the same session) distinguished 8) Three RTCP packet types are described in Section 64 Briefly summarize the information contained in each of these packet types 9) In Figure 64-9, which of the H323 channels run over TCP and which over UDP Why Sections 65-69 10) In Section 66, we discussed non-preemptive priority queuing What would be preemptive priority
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queueing Does preemptive priority queueing make sense for computer networks 11) Give an example of scheduling discipline that is not work conserving 12) Guaranteed Service provides an application no loss and firm bounds on delay Referring back to Figure 21-2, are there any applications that require both no loss and firm bounds on delay 13) What are some of the difficulties associated with the Intserv model and per-flow reservation of resources
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