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CHAPTER 1 Introducing Network Algorithmi... > 1.2 THE TECHNIQUES: NETWORK ALGORITH... - Pg. 7

1.2 The Techniques: Network Algorithmics 7 increasing problem: the issue of bandwidth within a router. It describes sample techniques, such as striping across internal buses and chip-to-chip links. The final sections of the book take a brief look at emerging services that must, we believe, be part of a well-engineered Internet of the future. First, routers of the future must build in support for measurement, because measurement is key to engineering networks to provide guarantees. While routers today provide some support for measurement in terms of counters and NetFlow records, Chapter 16 also considers more innovative measurement mechanisms that may be implemented in the future. Chapter 17 describes security support, some of which is already being built into routers. Given the increased sophistication, virulence, and rate of network attacks, we believe that implementing security features in networking devices (whether routers or dedicated intru- sion prevention/detection devices) will be essential. Further, unless the security device can keep up with high-speed links, the device may miss vital information required to spot an attack. 1.2 THE TECHNIQUES: NETWORK ALGORITHMICS Throughout this book, we will talk of many specific techniques: of interrupts, copies, and timing wheels; of Pathfinder and Sting; of why some routers are very slow; and whether Web servers can scale. But what underlies the assorted techniques in this book and makes it more than a recipe book is the notion of network algorithmics. As said earlier, network algorithmics recognizes the primary importance of taking a systems approach to streamlining network implementations. While everyone recognizes that the Internet is a system consisting of routers and links, it is perhaps less obvious that every networking device, from the Cisco GSR to an Apache Web server, is also a system. A system is built out of interconnected subsystems that are