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1、QueryingandVisualizingtheInternetAlbertoMendelzonUniversityofTorontohttp://db.toronto.edu:8020/aomweb/aom.htmlCopyright?AlbertoO.Mendelzon,1996UNIVERSITYOFTORONTOQUERYINGANDVISUALIZINGTHEINTERNET?IntroductionAnoverviewoftheInternetAccessinginformationontheInternet?TheWorld-WideWebH
2、ypertextThehttpprotocolTheHTMLlanguageFindinginformationintheWeb?QueryingtheWebResourcediscoveryGlobalinformationsystemsWebquerylanguages?VisualizingtheWebLargegraphvisualizationTheHy+visualizationsystemUNIVERSITYOFTORONTOWhatistheInternet??Def:Aninternetisafederationofcomputernetw
3、orksthatspeaktheTCP/IPprotocols?Def:TheInternetisaglobalinternetthatconnectshomes,schools,universities,corporations,andgovernmentsinover60countries.Motivation:?Datacommunicationhasbecomeafundamentalpartofcomputing?Nosinglenetworkhardwareisgoodforallapplications?Usersdesireuniversal
4、interconnectionUNIVERSITYOFTORONTOHistory?1970’sPacketswitchingARPANET?1980ConversiontoTCP/IPTCP/IPbundledwithBerkeleyUnix?1985NSFNET,56KbpsbackboneDomainNameSystem?1992InternetSocietyANSNET,45MbpsbackboneUNIVERSITYOFTORONTOInternetArchitectureCooperativeinterconnectionofnetworksNe
5、tworkscommunicatethroughroutersAllnetworksareequalHOSTINTERNETROUTERPHYSICALNETUNIVERSITYOFTORONTOPhysicalNetworking?Packet-switching(connectionless)?Circuit-Switching(connectionoriented)?LANs:EthernetTokenRingFDDIATMUNIVERSITYOFTORONTOTheTCP/IPProtocolsTransmissionControlProtocol/
6、InternetProtocolOtherprotocolsinsuite:UDP,ARP,RARP,ICMP,IGMP,...APPLICATIONSERVICESRELIABLETRANSPORTSERVICECONNECTIONLESSPACKETDELIVERYSERVICEUNIVERSITYOFTORONTOIP:Connectionlesspacketdelivery?Datagramdelivery?Connectionless?Routing?Unreliable(best-effort)IPADDRESS:Hostshaveunique3
7、2-bitIPaddressesMultihomehostshaveoneaddresspernetworkconnectiondb.toronto.edu128.100.2.100hplabs.hp.com15.255.176.47math.tau.ac.il132.67.64.4cs.toronto.edu128.100.1.105,128.100.1.13,128.100.2.81,128.100.2.15UNIVERSITYOFTORONTOTCP:ReliableStreamTransport?Streamoriented?Virtualcircu
8、itconnectionbetweenports?E
