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
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？ （）
A
OSPF stub areas increase the size of the LSDB with the addition of Type 3 and 5 LSAs
B
OSPF not so stubby areas are particularly useful as a simpler form of summarization
C
OSPF stub areas are always insulated from external changes
D
OSPF totally stubby cannot distinguish among ABRs for the best route to destinationsoutsidethe areas
E
OSPF stub areas can distinguish among ASBRs for destinations that are external to the OSPFdomain
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Why do large OSPF networks use a hierarchical design?（）A、to confine network instability to single areas of the network.B、to reduce the complexity of router configurationC、to speed up convergenceD、to lower costs by replacing routers with distribution layer switchesE、to decrease latency by increasing bandwidthF、to reduce routing overhead
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单选题One of the most important characteristics of OSPF is Multiple areas. Which statement best describes why this feature is such an important enhancement to earlier routing protocols?（）AThe network domain, when divided into areas, allows for the use of both IANA classful addressing and private addressing.BThe use of multiple areas allows for the use of prioritization.CAll computation is kept within the area, with minimum communication between the areas,allowing the network to scale to larger sizes.DIt is easier to implement security.
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单选题When verifying OSPF virtual link problems, which is an important item to check on the two transit OSPF routers?（）AOSPF process IDBOSPF router IDCOSPF network typeDOSPF memory usageEOSPF CPU utilizationFOSPF stub area configurations
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Why do large OSPF networks use a hierarchical design?（）Ato confine network instability to single areas of the network.Bto reduce the complexity of router configurationCto speed up convergenceDto lower costs by replacing routers with distribution layer switchesEto decrease latency by increasing bandwidthFto reduce routing overhead
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