单项选择题
A.IKE Phase 1 - P4S1 and P4S4，IKE Phase 2 - P4S2， P4S3 and P4S5
B.IKE Phase 1 - P4S2 and P4S4，IKE Phase 2 - P4S1， P4S3 and P4S5
C.IKE Phase 1 - P4S2 and P4S3，IKE Phase 2 - P4S1， P4S4 and P4S5
D.IKE Phase 1 - P4S1 and P4S2，IKE Phase 2 - P4S3， P4S4 and P4S5
单项选择题 Forthefollowingattempts，whichoneistoensurethatnooneemployeebecomesapervasivesecuritythreat，thatdatacanberecoveredfrombackups，andthatinformationsystemchangesdonotcompromiseasystem’ssecurity？（）
单项选择题 WhichoneofthefollowingcommandscanbeusedtoenableAAAauthenticationtodetermineifausercanaccesstheprivilegecommandlevel？（）
单项选择题 WhichtypeoffirewallisneededtoopenappropriateUDPportsrequiredforRTPstreams？（）
