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15: Ensuring Quality of Service
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The Internet is a "best-effort" service It's based on a first-come, first-served philosophy in which dropped packets and delivery delays are tolerated as inevitable by-products of fluctuating network traffic and available capacity This isn't due to some fundamental design flaw the Internet is that way on purpose Its designers knew full well from the outset that things had to be kept simple in order to attain the stated goal of a "universal network" This is why IP provides little more than an elegant addressing scheme along with a message format, and TCP offers only a modest system for managing network connections The Internet has no built-in infrastructure to handle such things as media access, security, foolproof error recovery, traffic management, and other advanced networking functions The designers had the foresight to push complexity out to the network's edge In fact, they didn't have much choice in the matter How else could the Internet accommodate so many different types of applications, and connections to virtually any make of computer This commonality is made possible by keeping the network core fairly dumb Consider the implementation of TCP/IP within the seven-layer OSI model, and you'll see that the Internet offloads as much as possible, assuming responsibility only up to layer 3, the network layer The Internet's magic is that it pawns most complexity off onto LANs, end-host computers, and various kinds of edge network devices Without this strategy, the Internet could not have grown to the stupendous size and capability we now take for granted But there's trouble looming in paradise Best-effort delivery service is not sufficient to transport in a timely fashion all the traffic on the Internet and in corporate networks running TCP/IP There is more traffic than ever, taxing the LAN and WAN links; moreover, a new breed of applications (including voice and video) can't tolerate delay Organizations, ISPs, and the entire Internet
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community recognize the need to prioritize a network so that critical and time-sensitive data gets through as quickly as possible, and nonessential traffic is required to wait This chapter discusses the emerging technologies that promise to deliver prioritization of network traffic
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Convergence, Multimedia, and Rising Expectations
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The Internet's future difficulties will probably all come in the form of new types of traffic This expansion is driven by a whole new breed of network applications featuring real-time, two-way, time-sensitive characteristics For these convergence applications, the 'Net is to become the unifying platform over which all mass communication takes place Convergence has already started, represented by multimedia technologies such as WebTV, video- conferencing, Web radio, Microsoft's NetMeeting, distance learning, and others Perhaps the most significant convergence medium is telephone service over the Internet These and other new-wave media are exposing IP's structural shortcomings, mostly because the applications require committed end-to-end service in order to work properly As a result, IP's very strengths are increasingly becoming its weaknesses This situation is similar to the emergence of the World Wide Web in the early 1990s At that time, everybody was using some form of windows on their desktops, and the Internet's alphanumeric interface became unsatisfactory This time around, the need for change is driven mostly by electronic commerce For the Internet to indeed be the world's primary business venue, its infrastructure must be upgraded to include all important communications media, not just Web browsing, messaging, and file transfer Therefore, IP must be somehow upgraded to handle the multimedia applications brought online by convergence Given the tremendous success of the Internet, however, only a fool would propose replacing IP (though a few actually have) What's needed instead is an IP-compatible technology that can give multimedia applications the end-to-end service levels they need Even apart from the demands of multimedia, the Internet must be more reliable if it is to become a serious place of business The industry's response to these challenges is Quality of Service (QoS)
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