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1、SpotlightContentDeliveryNetworks:StatusandTrendsAthenaVakaliandGeorgePallis?AristotleUniversityofThessalonikiCDNsimprovenetworkperformanceandofferfastandreliableapplicationsandservicesbydistributingcontenttocacheserverslocatedclosetousers.heWeb’sgrowthhastransf
2、ormedcommu-ResearchershavewidelyconsideredcontentnicationsandbusinessservicessuchthatdeliverynetworkstobeaneffectivesolutiontoTspeed,accuracy,andavailabilityofnet-reducingthesedisadvantages.2,3CDNsactastrust-work-deliveredcontenthasbecomeabsolutelyedoverlaynetw
3、orksthatofferhigh-performancecritical—bothontheirowntermsandintermsofdeliveryofcommonWebobjects,staticdata,andmeasuringWebperformance.Proxyserverspar-richmultimediacontentbydistributingcontenttiallyaddresstheneedforrapidcontentdeliveryloadamongserversthatareclo
4、setotheclients.4,5byprovidingmultipleclientswithasharedcacheCDNbenefitsincludereducedoriginserverload,location.Inthiscontext,ifarequestedobjectreducedlatencyforendusers,andincreasedexistsinacache(andthecachedversionhasnotthroughput.CDNscanalsoimproveWebscalabil
5、-expired),clientsgetacachedcopy,whichtypical-ityanddisperseflash-crowdevents.Hereweofferlyreducesdeliverytime.anoverviewoftheCDNarchitectureandpopularWebcachinghasthreeprimarybenefits.First,CDNserviceproviders.itreducesbandwidthconsumption,networkcon-gestion,an
6、dnetworktrafficbecauseitstorestheCDNOverviewfrequentlyrequestedcontentclosertoclients.Sec-CDNsfirstemergedin19986toaddressthefactthatond,itreducesexternallatency(thetimerequiredtheWebwasnotdesignedtohandlelargecontenttotransferobjectsfromtheoriginservertoproxyt
7、ransmissionsoverlongdistances.7,8Accordingtoservers)becauseitdeliverscachedobjectsfromtheNetworkWorldFusion(www.nwfusion.com),aboutproxyservers.Finally,cachingimprovesreliabili-2,500companiesnowuseCDNs.IntheUSalone,fortybecauseclientscanobtainacachedcopyevenife
8、xample,StorigenSystems(www.storigen.com)esti-theremoteserverisunavailable.UsingasharedmatesthattheCDNmarketgeneratedUS$905mil-proxycache,however,hastwosignificantdraw-lionin
