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1、CloudComputingCloudcomputingisaserviceprovidedbywayofadynamicscalablevirtualizedcomputingmodelresourcesovertheInternet.Thismodeoffersavailable,convenient,on-demandnetworkaccessintoasharedpoolofcomputingresourcescanbeconfigured(resources,includingnetworks,servers,storage,applicat
2、ions,services),theseresourcescanbequicklyprovided,justputitlessadministration,orwithserviceprovidersrarelyinteract・Itiscalculatedbythedistributionofthelargenumberofdistributedcomputers,ratherthanthelocalcomputeroraremoteserver,runningenterprisedatacentersandtheInternetwillbemore
3、similar.Thisallowscompaniestoswitchtotheapplicationoftheresourcesrequired,accordingtodemandaccesstoacomputerandstoragesystems.Likeasinglegeneratorfromtheoldmodeltoacentralizedpowerplantmodel・Itmeansthatcomputingpowercanalsobeusedasatradablecommodity,likegas,waterandelectricity,a
4、saccesstoconvenient,inexpensive・ThebiggestdifferenceisthatitistransmittedthroughtheInternet・Cloudcomputingservicecharacteristicsandnatureofclouds,watercirculationontheInternethasacertainsimilarity,sothecloudisaveryaptanalogy・Cloudcomputingproposedforthedevelopmentofcomputersplay
5、edaroleinmakingthenetworkmorewidelybased・Inmyopinioncloudcomputinghasfoursignificantadvantages:Cloudcomputingprovidesthemostreliableandsecuredatastoragecenter,usersdonothavetoworryaboutdataloss,virusattacksandotherproblems;cloudcomputingclientdevicesrequireaminimum,isalsothemost
6、convenience;cloudcomputingdataandapplicationscanbeeasilysharedbetweendifferentdevices;cloudcomputingasweusethenetworkprovidesalmostinfinitenumberofpossibilities.Butontheotherhandtherearealsodisadvantagestwoaspects:first,itissafe,becausethecloudcomputingpoweranddatainthecloud,how
7、toensurethesecurityofcustomerdataisarelativelyimportant・Securityhastwoaspects,oneisthedataisnotlost,thegeneralserviceproviderswillhavetheabilitytosolvebackup,butalsooccursoccasionallylost;Anotheristhatyourdatawillnotleak,althoughthiswilltakesomemeasurestoserviceproviders,nottoou
8、tsiders,suchashackerattackstogetdata,buttheprob
