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

For the following attempts， which one is to ensure that no one employee becomes a pervasive securitythreat， that data can be recovered from backups， and that information system changes do not compromisea system’s security？（）

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

单项选择题

Which one of the following commands can be used to enable AAA authentication to determine if a user canaccess the privilege command level？（）

A.aaa authentication enable method default
B.aaa authentication enable default
C.aaa authentication enable level
D.aaa authentication enable default local