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计算机网络原理英文版课件下C hap ter1-创作者时间2024年X月目录第章1I nt ro d uct i o nt oC o mp u ter N et w o rksDefinitionof computernetworks01Explains theconcept of computer networksBenefitsof computernetworks02Discusses theadvantages ofusing computernetworksTypesofcomputernetworks03Introduces differentcategories ofcomputernetworksI mp orta nc eof C om pu ter N etwor ksCommunication andcollaboratioInformation Resourcenaccess sharingAllowsforFacilitates easyefficientEnhancesaccessto datautilizationofconnectivity andandknowledgeresourcesteamworkC omp onen tsof aCompu terN etwor kNodesProtocols LinksPhysicalorRules fordatawirelessDevices liketransmission andconnectionscomputers,communicationbetween nodesservers,androuters第章2N etw ork Model sApplication Layer01Protocols suchas HTTPand SMTPTransport Layer02TCP andUDP protocolsInternetLayer03IP protocolN etworkSta nda rdiz ati onOrganizatioImportanceBenefits nsIEEE,IETF,ITUPromotesEnsuresinnovation,interoperabilityenhancesandreliabilitycompatibilityC o n cl u si o nUnderstandingnetwork modelsand standardizationiscrucial forbuilding andmaintaining efficientcommunicationnetworks.By followingstandardprotocols andmodels,organizations canensureseamless connectivityand reliableoperation.第章3P hysi calL ayerTr a n s mi ss ion MediaFactorsTypes ofinfluencing Characteristitransmissiomedia csof eachnmedia selectiontypeBandwidth,Speeddistance,costCopper,fiber,requirements,wirelessenvironment,budgetDefinition of signal encoding01Converting datainto signalsTypesofsignal encoding02NRZ,Manchester,8B/10BImportance ofencoding03Enhancing dataintegrityC o n cl u si o nThephysical layer is essentialin computernetworks asitensures thereliable andefficient transmissionofdata.Understanding thefunctions ofthe physicallayer,transmission media,signalencoding,and multiplexingiscrucial fornetwork engineersto designandmaintain effectivecommunication systems.第章4D ata Li nk LayerMAC Addres sesTypes ofDefinitionMAC AddressofMAC addressingresolutionaddresses schemesprotocolResolves IPUnicast,addresses toUniquemulticast,andMAC addressesidentifiersbroadcastina localassignedtoaddressingnetworknetworkinterfaces forcommunicationEvolutionof Ethernet01From10Mbps toGigabit Ethernetand beyondEthernetframe structure02Preamble,destination andsource MACaddresses,type field,data,and CRCEthernetswitching andbridging03Forwarding framesbased onMAC addressesinLANsC o n clu sio nThedata linklayer playsa crucialrole inensuringreliable communication between devicesona network.By implementingerror detection,flow control,andframing techniques,it enablesthe efficienttransfer ofdatapackets acrossphysical connections.第章5Netw ork Layercommunicationnetworks.I PProtoc olOverviewof IPv6the Internetfeatures and IPv4Protocol advantagesaddressingDiscussing theHighlightingthestructure ofIPv4Explaining theimprovementsinaddressesbasics ofIPIPv6protocolprotocolIP routingprocess01Explaining howIP packetsare routedin anetworkRoutingtables02Illustrating thestructure andusage ofroutingtablesRoute aggregationandsummarization03Discussing techniquesto optimizeroutingtablesS um ma ryNetworklayer RoutingIP protocolfunctionsalgorithms overviewIPv4andIPv6Distance vectorfeaturesRouting,and linkstateaddressing,androutingsubnetting第章6Tran spo rtL ayerIn troduc tion toTransp ortLa yerFunctionsof Errorthehandling Segmentatitransportand flowon andlayercontrol reassemblyDividesdata intoDetectsandsmaller unitsforEnsures reliablecorrectserrors,transmissiondata deliveryregulatesdataflowcommunication.User DatagramProtocolfeatures01Connectionless,lightweight protocolUDPheader structure02Contains sourceand destinationportsApplications ofUDP03Real-time multimediastreaming,DNSC on clu sio nIn conclusion,the transportlayer playsa crucialrole inensuringreliable datatransmission incomputernetworks.TCP providesa reliableconnection,whileUDP offerssimplicity andspeed.Quality ofServicemechanisms enhanceperformance andprioritizecritical traffic.Understanding theseprotocols andmechanismsis essentialfor effectivenetworkcommunication.第章7A pp li cationLayerapplication layerprotocolsinclude HTTP,FTP,and DNS.HT TPProtoc olHTTPHypertextWeb serverrequest andTransferand clientresponseProtocol interactionmessagesInclude headersCommunicationandbodyDefines howbetweencontentmessagesarebrowsers andformattedandserverstransmittedDomain NameSystemoverview01Converts domainnames toIP addressesDNSresolution process02Locates theIP addressof adomain nameDNSrecord types03Includes A,CNAME,MX recordsCon clu sionInconclusion,the applicationlayeriscrucial inenablingcommunicationbetweendifferentapplications overanetwork.Understanding protocolslikeHTTP,FTP,and DNSis essentialfor developingandmaintaining networkapplications.第章8Network Secu rit ysensitiveinformation.E nc ryp tion Tech ni quesPublic keySymmetricinfrastructur DigitalAsymmetricencryption esignatures encryptionInvolvesa publicVerifytheManages keysandprivate keyUsesa singlekey authenticityofand digitalpairforboth messagescertificatesencryptionanddecryptionPacket filteringfirewall01Examines packetsbased onpredeterminedcriteriaProxy firewall02Acts asan intermediarybetween internalandexternal networksStatefulinspection firewall03Tracks thestate ofactive connectionsConclusionNetwork securityis acomplex fieldthat requiresconstantvigilance andproactive measures.Byunderstanding theimportance ofencryption,firewalls,and intrusiondetection systems,organizations canenhancetheir overallsecurity postureand protectagainstevolving threatsin thedigital landscape.第章9Conclusionan dFutu reP erspect ivesF utu reTren dsi nNetworki ngOpportunities andPredictionsEmerging challengesfor thetechnologiein thefuture ofsin networkcomputernetworking industrynetworksInsights intotheExploration ofupcomingtrendsIntroduction topotentialgrowthandnewareas anddevelopmentsadvancementsinobstaclesthe field。