计算机网络基础知识课件英文版

Introduction toComputerNetworksDiscover theworld ofcomputer networks,from theirdefinition andsignificance totheirclassification andprotocols.Explore thefascinating conceptsof OSIandTCP/IP models,network topologies,devices,security,performance optimization,applications,and management.What isa ComputerNetworkA computernetwork isa collectionof interconnecteddevices thatallow fordata exchangeand sharingbetween users.Learn aboutits definitionand thesignificance itholds intodays digitalage.Types ofComputer NetworksLocalArea NetworkWide AreaNetwork InternetLANWANA globalnetwork that connectsA networkthat coversa smallA networkthat spansa largemillions ofcomputers andgeographicalarea,such asa geographicalarea,connecting networksworldwide.single buildingor campus.multiple LANs.Network Protocols1DefinitionProtocols arerules andconventions thatgovern howdata istransmitted andreceived overanetwork.2Common ProtocolsExplorewidely-used protocolssuch asTCP/IP,HTTP,FTP,and DNS.OSI ModelHierarchicalStructure Functionalityof EachLayerThe OSImodel iscomposed ofseven layers,each withDiscover theroles ofthe physical,data link,network,its specificfunction.transport,session,presentation,and applicationlayers.TCP/IP Protocol1OverviewThe TCP/IP protocolis thefoundation ofthe moderninternet,enabling reliableandefficient communicationbetween devices.2Specific ProtocolsLearn about TCP,UDP,IP,ICMP,and otherkey protocolswithin theTCP/IP suite.Network TopologiesBusStarA simple,linear network topology whereall devicesA network topology where devices are connected toashare acommon communicationmedium.central hubor switch.Ring TreeAnetworktopologywheredevicesareconnectedin aA hierarchicalnetworktopologywith multiplelevels ofcircularmanner,forming aclosed loop.branching.Network DevicesNetworkInterface CardNIC HubAnessential hardwarecomponent thatenables Asimple networkingdevice thatbroadcasts datatonetwork connectivityfor computers.all connecteddevices.Switch RouterAmore advanceddevice thatintelligently directsA devicethatconnectsmultiple networksegmentsdata packetsto theirintended destination.and directsdata betweenthem.Network Security1Definition2Common Threats3PreventiveMeasuresNetwork securityrefers toIdentify andunderstandthe protectionof networkcommon networksecurity Explorevarious securityinfrastructureand devicesthreats,such asmalware,measures,includingfrom unauthorizedaccess hacking,and socialencryption,firewalls,and potentialthreats.engineering.intrusion detectionsystems,and userawareness training.Network PerformanceOptimizationData ReducingLatency IncreasingTransmissionBandwidthDiscover techniques to minimizeRatelatency,ensuring fasterresponseLearn aboutfactors thatinfluence Exploremethods toexpandtimes andsmoother networktransmissionspeeds,such asnetwork capacityand improveperformance.bandwidth,latency,and datatransfer rates.throughput.Network ApplicationsEmailFile SharingRemote LoginInternet ofThingsIoTExplore theDiscover variousfile-Learnaboutremoteconvenience andsharing methodsand logintechniques,Discover howimportanceof applicationsthat enablingusers tointerconnecteddeviceselectronic mailfor facilitatecollaborative accesscomputers fromarerevolutionizingmodern work.distant locations.various industriesandcommunication.daily life.Network ManagementNetwork NetworkNetworkUpgradingMonitoring MaintenanceStrategiesto enhancenetworkcapabilities,adapt tochangingTools andtechniquestokeep Bestpractices forregular upkeepdemands,and ensurescalability.track ofnetwork performance,and troubleshootingof networkavailability,and potentialissues.hardware andsoftware.。