IPsec,alsoknownastheinternetProtocol(),definesthearchitectureforsecurityservicesforIPnetworktrafficIPsecdescribestheframeworkforprovidingsecurityatheIPlayer,aswellasthesuiteofprotocolsdesignedtoprovidethatsecurity:through_()_andencryptionofIPnetworkpackets.IPeccanbeused10protectnetworkdata,forexample,bysettingupcircuitsusingIPsec(),inwhichalldatabeingsentbetweentwoendpointsisencrypted,aswithaVirtual()Networkconnection;forencryptingapplicationlayerdata;andforprovidingsecurityforrouterssendingroutingdataacrossthepublicinternet.InternettrafficcanalsobesecuredfromhosttohostwithouttheuseofIPsec,forexamplebyencryptionatthe(请作答此空)layerwithHTTPSecure(TTPS)oranthetransportlayerwittheTransportLayerSecurity(TLS)protocol.
A.network
B.transport
C.application
D.session
正确答案是C