单项选择题

For the following statements， which one is the strongest symmetrical encryption algorithm？（）

A.AES
B.3DES
C.DES
D.Diffie-Hellman

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单项选择题

Which item is the correct matching relationships associated with IKE Phase？（）

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？（）

A.Strategic security planning
B.Disaster recovery
C.Implementation security
D.Operations security