多项选择题

What are the three OSPF authentication methods supported on the ERX Edge Router?（）

A.A
B.B
C.C
D.D
E.E

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单项选择题

Where is OSPF authentication configured on the ERX Edge Router?（）

A.A
B.B
C.C
D.D

单项选择题

During OSPF adjacency formation, in which state is a router in when an OSPF hello packet has been sent but bi-directional communication has not been achieved?（）

A.A
B.B
C.C
D.D

单项选择题

During OSPF adjacency formation, in which state is a router in when it is negotiating to be in charge of the database synchronization process?（）

A.A
B.B
C.C
D.D