现代系统分析设计章软件起源on教师资源modern systems analysis and design 9e by valacich 1.pptx

ModernSystemsAnalysisandDesignNinthEditionChapter12TheOriginsofSoftwareCopyright?2020,2017,2014PearsonEducation,Inc.AllRightsReserved

LearningObjectives12.1Distinguishbetweenfileserverandclient/serverenvironments,contrastinghoweachisusedinaLAN12.2DescribecloudcomputingandothercurrenttrendsthathelporganizationsaddressISinfrastructure-relatedchallenges12.3DescribestandardsshapingthedesignofInternetbasedsystems,optionsforensuringInternetdesignconsistency,sitemanagementissuesinfluencingcustomerloyalty,trustworthiness,andsecurity

Figure12-1:SystemsDevelopmentLifeCycle

TheProcessofDesigningDistributedandInternetSystems12.1Distinguishbetweenfileserverandclient/serverenvironments,contrastinghoweachisusedinaLANThisprocessissimilartodesigningsingle-locationsystemsDuetomulti-locationdeployment,numerousdesignissuesmustbeconsideredThereismoreopportunityforfailureduetonumberofcomponentsMainissuesinvolveensuringreliability,availability,survivability,performance

Figure12-2:esandDeliverablesfromDesigningDistributedSystems

DesigningSystemsforLANs12.1Distinguishbetweenfileserverandclient/serverenvironments,contrastinghoweachisusedinaLANLocalareanetwork(LAN)–cabling,hardware,andsoftwareusedtoconnectworkstations,computers,andfileserverslocatedinaconfinedgeographicalarea(typicallywithinonebuildingorcampus)Fileserver–devicethatmanagesfileoperationsandissharedbyeachclientPCattachedtoaLAN

Figure12-3:FileServerModel

LimitationsofFileServers12.1Distinguishbetweenfileserverandclient/serverenvironments,contrastinghoweachisusedinaLANThreeprimarylimitationsoffileservers:ExcessivedatamovementTheneedforapowerfulclientworkstationDecentralizeddatacontrol

Figure12-4:FileServersTransferFilesWhenDataareRequestedFromaClient

DesigningSyst