OSPF is a link-state routing protocol。It is designed to be run internal 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 （73）。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 （）。

connection

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答案：

解析：

题干中提到"OSPF is a link-state routing protocol designed to be run internal to a single system"，暗示了OSPF是为单个自治系统内部运行的路由协议设计的。接下来提到每个OSPF路由器维护一个描述自治系统拓扑的相同数据库，从这里计算出路由表。根据题干中的描述，选项B “tree”（树）与题干中的描述相符，因为OSPF通过构建最短路径树来计算路由表。因此，正确答案是B。

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本文链接：OSPF is a link-state routing protocol。It is design

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