Acompanying commentary rice et al pnas 2005 dmc does

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Unformatted text preview: the data best?) • Many of these 7 models considered produce similar macroscopic features (degree distribution, clustering, diameter, etc). • Delve into microscopic details and let the data distinguish between the 7 models. • Must start with models that are accurate statistical fits to data! (different type of model validation). (Acompanying commentary, Rice et al PNAS 2005, DMC does not reproduce giant component.) • Vladimir Filkov lecture next time 2/7/11 “Understanding Internet Topology: Principles, Models, and Validation” D. Alderson, L. Li, W. Willinger, and J. C. Doyle, IEEE/ACM Trans. on Networking, 13 (6), 2005. • I chose this paper since they explicitly claim to deal with validation. Overview • “First principles” approach to router-level Internet modeling. • Consider capability of real routers (annotated graph). • Consider core versus edge requirements. • From this design “optimal” networks. • Compare with sampled topologies of actual internet, and show that constraint-capacity performance curve of real routers fit with their hypothesis. Motivation – Need accurate models of the internet • Testing and evaluating protocols • Protecting against and detecting attacks • Improved designs and resource provisioning → need annotated graphs, with bandwidth capacity explicit (also router buffer capacity). • Given topology generated from a model, which statistical properties to test? • Ascribing meaning to model details. (Why would a random construction relate to an engineered network?) Router level connectivity • Layer 2 (data-link layer) connectivity Open Systems Interconnection (OSI) Reference Model 7 Application Layer 6 Presentation Layer 5 Session Layer 4 Transport Layer 3 Network Layer 2 Data Link Layer 1 Physical Layer Past work – structural topology generators • Random connectivity (e.g., Waxman model) • Transit-stub models of Zegura (Georgia Tech Internetwork Topology Models) • But this miss the broad-scale (power-law-like) distributions in connectivity presumed to b...
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