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1、.....virtualprivatenetworkAvirtualprivatenetwork(VPN)isaprivatecommunicationsnetworkoftenusedbycompaniesororganizations,tocommunicateconfidentiallyoverapublicnetwork.VPNtrafficcanbecarriedoverapublicnetworkinginfrastructure(e.g.theInternet)ontopofstandardprot

2、ocols,oroveraserviceprovider'sprivatenetworkwithadefinedServiceLevelAgreement(SLA)betweentheVPNcustomerandtheVPNserviceprovider.AVPNcansenddatae.g.voice,dataorvideo,oracombinationofthesemedia,acrosssecuredandencryptedprivatechannelsbetweentwopoints.Authentica

3、tionmechanismVirtualprivatenetworkscanbeacosteffectiveandsecurewayfordifferentcorporationstoprovideusersaccesstothecorporatenetworkandforremotenetworkstocommunicatewitheachotheracrosstheInternet.VPNconnectionsaremorecost-effectivethandedicatedprivatelines.Gen

4、erally,afirewallsitsbetweenaremoteuser'sworkstationorclientandthehostnetworkorserver.Astheuser'sclientestablishesthecommunicationwiththefirewall,theclientmaypassauthenticationdatatoanauthenticationserviceinsidetheperimeter.Aknowntrustedperson,sometimesonlywhe

5、nusingtrusteddevices,canbeprovidedwithappropriatesecurityprivilegestoaccessresourcesnotavailabletogeneralusers.ManyVPNclientprogramscanbeconfiguredtorequirethatallIPtrafficmustpassthroughthetunnelwhiletheVPNconnectionisactive,forincreasedsecurity.Fromtheuser'

6、sperspective,thismeansthatwhiletheVPNconnectionisactive,allaccessoutsidethesecurenetworkmustpassthroughthesamefirewallasiftheuserwerephysicallyconnectedtotheinsideofthesecurednetwork.Thisreducestheriskthatanattackermightgainaccesstothesecurednetworkbyattackin

7、gtheVPNclient'shostmachine:toothercomputersontheemployee'shomenetwork,学习参考.....oronthepublicinternet,itisasthoughthemachinerunningtheVPNclientsimplydoesnotexist.Suchsecurityisimportantbecauseothercomputerslocaltothenetworkonwhichtheclientcomputerisoperatingma

8、ybeuntrustedorpartiallytrusted.Evenwithahomenetworkthatisprotectedfromtheoutsideinternetbyafirewall,peoplewhoshareahomemaybesimultaneouslyworkingfordifferentemployersovertheirrespectiveVP