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IntroductiontoNetworkSecurityChapter1NetworkArchitectureDr.DougJacobson-Introductionto1NetworkSecurity-2009ChapterTopics•Introduction•Layeredarchitecture•Keyterms•ProtocolFunctions•OSImodel•TCP/IPModelDr.DougJacobson-Introductionto2NetworkSecurity-2009CourseOverview•Protocols•ProtocolImplementations•SecurityIssues•PerformanceIssues•Severalprogrammingassignments–packetsniffer–spamemailDr.DougJacobson-Introductionto3NetworkSecurity-200918401844FirstTelegraphline1861Over2200telegraphoffices1866Firsttransatlanticcable1875Firstwordsonatelephone1880over30,000phones19001900over600,000phones1910over5,000,000phonesHistoryofNetworking1920over11,000,000phones1950sPoint-to-pointnetworktomainframes19601968300baudmodem1969ARPANET(4nodes)1970197115nodesinAPRANET1973TCP/IPdevelopment1973EthernetwasproposalinaPh.D.Dissertation1977TCP/IPtestbed1979UUCPnet19801980ARPANETvirus(accidental)1983TCP/IPbecomestheprotocolforARPANET1984over1000hosts1986NSFNETisstarted1987over10,000hosts1988Internetworminfectsover6,000hosts1989over100,000hosts19901991WWWreleasedbyCERN1992over1,000,000hosts1995FirstISPsstartedDr.DougJacobson-Introductionto41996over10,000,000hostsNetworkSecurity-20092000LayeredArchitectureProtocolApplicationApplicationProtocolNetworkServicesNetworkServicesCommunicationsNetworkDr.DougJacobson-Introductionto5NetworkSecurity-2009LayeredArchitectureSAPServiceAccessPointsProtocolLayerNLayerNProtocolLayerN-1LayerN-1Dr.DougJacobson-Introductionto6NetworkSecurity-2009LayeredArchitecture•Broughtaboutbecauseofaneedforstandards•Layers:–takeinformationfromabove(layerN-1)–andpassinformationbelow(layerN+1)•Theservicesareprovidedthroughtheserviceaccesspoints(SAPs)•Layerfunctionalityisimplementedthroughanentity•EachlayercontainsoneormoreentitieswhichareresponsibleforprovidingservicestotheN+1layerDr.DougJacobson-Introductionto7NetworkSecurity-2009LayeredArchitecture•Ino
