单项选择题

When configuring OSPF on the ERX, what is the default auto-cost reference-bandwidth value?（）

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

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单项选择题
Which CLI command is used to display BGP-learned routes that are now in the OSPF link-state database?（）

A.A
B.B
C.C
D.D
单项选择题
if all OSPF routers on a broadcast network have the same OSPF priority, which parameter is used to determine the new BDR at the time of a DR failure?（）

A.A
B.B
C.C
D.D
单项选择题
Given the set of routers, each with an interface on the same multi-access network: Which router can never be a designated router on that multi-access network?（）

A.RouterA
B.RouterB
C.RouterC
D.RouterD
单项选择题
You are running OSPF between two ERX Edge Routers across an OC-12c link with HDLC encapsulation. How many designated routers are present for this link?（）

A.0
B.1
C.2
D.3
单项选择题
What is the default authentication method on an OSPF interface?（）

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