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

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单项选择题

During OSPF adjacency formation, in which state is a router when it is sending LSA header information to its neighbor?（）

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

单项选择题

Which statement is true about the frequency of OSPF LSA transmissions?（）

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

单项选择题

By default, how often does an ERX Edge Router send an OSPF link-state advertisement in a stable network?（）

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