問答題What is an RPF check？

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2.單項選擇題Which statement best describes OSPF external LSAs （type 5）？（）

A.OSPF external LSAs are automatically flooded into all OSPF areas， unlike type 7 LSAs， which require that redistribution be configured.
B.External LSAs （type 5） are automatically changed to type 1 LSAs at ASBRs.
C.Type 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.
D.External network LSAs （type 5） redistributed from other routing protocols into OSPF are not permitted to flood into a stub area.

3.單項選擇題This question is about the formation of OSPF adjacency. An OSPF adjacency will not form correctly across a point-to-point link in the same area. Which would most likely cause this problem？（）

A.Each interface has a different OSPF cost.
B.Each interface is configured with secondary addresses as well as primary addresses.
C.Each interface has a different MTU size.
D.Each interface is configured with theip unnumbered loopback 0 command.