单选题Which statement best describes OSPF external LSAs （type 5）？（）AOSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.BExternal LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.CType 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.DExternal network LSAs (type 5) redistributed from other routing protocols into OSPF are not permitted to flood into a stub area
单选题
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
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多选题OSPF stub areas are an important tool for the Network designer； which of the following two shouldbe considered when utilizing OSPF stub areas？ （）AOSPF stub areas increase the size of the LSDB with the addition of Type 3 and 5 LSAsBOSPF not so stubby areas are particularly useful as a simpler form of summarizationCOSPF stub areas are always insulated from external changesDOSPF totally stubby cannot distinguish among ABRs for the best route to destinationsoutsidethe areasEOSPF stub areas can distinguish among ASBRs for destinations that are external to the OSPFdomain
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多选题Which three statements about OSPF partial SPF are true？（）AIf it is triggered by Type 4， all Type 4 LSAs that announce a certain ASBR and all Type 5 and 7 LSAs are processedBIf it is triggered by Types 5 and 7， all Type 5 and 7 LSAs that contribute to a certain destination are processed.CIf it is triggered by Type 2， all Type 2 LSAs that contribute to a certain destination are processed.DIf it is triggered by the change of Type 3， 4， 5， and 7 LSAs.EIf it is triggered by the change of Type 2， 3， 5， and 7 LSAs
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多选题Which of the following is true about routers internal to a totally NSSA area?（）ARouters cannot redistribute external routes into the area.BRouters should have zero Type 3 LSAs in their LSDBs.CRouters should have zero Type 5 LSAs in their LSDBs.DRouters should learn default routes from the ABRs attached to the area.
多选题You want to limit the number of Type 7 LSAs to be converted into Type 5 LSAs at an appropriate ARB. Which two commands should you use from the [edit] hierarchy level within the JUNOS software configuration mode？（）Aset protocols ospf area-range network/mask-lengthBset protocols ospf area area-id nssa area-range network/mask-lengthCset protocols ospf area area-id area-range network/mask-length restrictDset protocols ospf area area-id nssa area-range network/mask-length restrict
单选题Which one of these statements is true of OSPF type 5 LSAs？ （）A They are used to summarize area routes to other areas.B They are used in not-so-stubby areas to propagate external routes.C They are used to notify areas of the ASBR.D They are flooded to all areas except stub areas （external route）.
多选题The maximum number of routers per OSPF area typically depends on which three factors?（）Athe kind of OSPF areas being implementedBthe number of external LSAs in the networkCthe number of DRs and BDRs in the areasDthe number of virtual links in the areasEhow well the areas can be summarizedFthe use of LSA filters
单选题Which router translates the Type 7 LSAs into Type 5 LSAs, according to RFC 1587 (OSPF NSSAOption) in an OSPF NSSA with more than one ABR?（）AThe router receiving the route translates the Type 7 LSA into a Type 5 LSA.BThe ABR with the lowest router ID translates all Type 7 LSAs into Type 5 LSAs.CThe ABR with the highest router ID translates all Type 7 LSAs into Type 5 LSAs.DAll ABRs translate the Type 7 LSAs into Type 5 LSAs depending on which one has the lowest cost to the route.
单选题Which statement best describes OSPF external LSAs （type 5）？（）AOSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.BExternal LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.CType 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.DExternal network LSAs (type 5) redistributed from other routing protocols into OSPF are not permitted to flood into a stub area
单选题Which one of these statements is true of OSPF type 5 LSAs？（）AThey are used to summarize area routes to other areas.BThey are used in not-so-stubby areas to propagate external routes.CThey are used to notify areas of the ASBR.DThey are flooded to all areas except stub areas （external route）.
多选题You want to limit the number of Type 7 LSAs to be converted into Type 5 LSAs at an appropriateABR. Which two commands should you use from the [edit] hierarchy level within JUNOS configuration mode?（）Aset protocols ospf area-range network/mask-lengthBset protocols ospf area area-id nssa area-range network/mask-lengthCset protocols ospf area area-id area-range network/mask-length restrictDset protocols ospf area area-id nssa area-range network/mask-length restrict