What are three purposes of a PSNP?（）

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

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