OSPF is a link-state routing protocol。It

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问题 OSPF is a link-state routing protocol。It is designed to be runinternal to a single (  )system。Each OSPF router maintains an identical (  )describing the autonomous system’s topology。From this database,a routing table is calculated by constructing a shortest-path (  )。OSPF recalculates routes quickly in the face of topological changes,utilizing a minimum of routing (  ) traffic。OSPF provides support for equal-cost multipath。An area routing capability is provided,enabling an additional level of routing protection and a reduction in routing protocol(  )。A.connectionB.treeC.decisionD.bitmap

选项 A.connection
B.tree
C.decision
D.bitmap

答案 B

解析 OSPF是一种链路状态路由协议。该协议被设计成运行在单一的自治系统内部。每一个OFPF路由器都保持了同样的数据库,该数据库可以描述自治系统的拓扑图。通过该数据库,可以搭建的最短路径树以此计算路由表。OSPF在拓扑发生变化时,能很快计算出路由,但是使用了最小的路由协议流量。OSPF支持多条等价路径。OSPF提供区域路由的能力,在路由协议流量中赋予一个额外的路由保护和路由剪截能力。
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