单项选择题

A.whentherouterisbootedup
B.whentherouteradministrativelydoesanoshutdown"ontheIPSecSA
C.whentrafficmatchesalineoftheaccess-listtiedintothecrypto-mapintherouterconfiguration,andthatparticularIPSecSAisnotalreadyup
D.whentheISAKMPSAcompletesnegotiationofallIPSecSAs(oneperaccess-listlineinthecryptoACL),itwillbebroughtupimmediately