Yale CPSC 433 - taxonomy (44 pages)

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taxonomy



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A Taxonomy of Communication Networks Y Richard Yang 1 12 2012 1 Outline Recap q A taxonomy of communication networks q Summary 2 Recap A protocol defines the format and the order of messages exchanged between two or more communicating entities as well as the actions taken on the transmission or receipt of a message or other events Some implications of the past ARPANET is sponsored by ARPA design should survive failures The initial IMPs routers were made by a small company keep the network simple Many networks internetworking need a network to connect networks Commercialization architecture supporting decentralized autonomous systems 3 Recap Internet Physical Infrastructure Residential access Cable Fiber DSL Wireless ISP Backbone ISP ISP The Internet is a network Campus access e g Ethernet Wireless of networks Each individually administrated network is called an Autonomous System AS 4 Source http www internet2 edu info 5 Source http www internet2 edu info 6 Recap Internet ISP Connectivity Roughly hierarchical Divided into tiers Tier 1 ISPs are also called backbone providers e g AT T Verizon Sprint Level 3 Qwest An ISP runs private Points of Presence PoP where its customers and other ISPs connect to it ISPs also connect at public Internet Exchange Point IXP public peering http en wikipedia org wiki List of Internet exchange points by size 7 Northern CrossRoads NoX Aggregation Point AP http www uis harvard edu emerging technologies Northern Crossroads Map gif 8 http www oregon gigapop net images OregonGigapop2 gif 9 10 Summary Internet State Global Internet 39 908 ASs and growing Routing overhead convergence AS updates 2 per second on average 7000 per second peak rate Convergence after a single event can take up to tens of minutes http bgp potaroo net as2 0 bgp active html 11 Observing the Internet Read the manual traceroute and try it on a zoo machine usr sbin traceroute machine name q Look at the web sites of the routers you see through traceroute q Try fixedorbit



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