一个由多个路由器相互连接构成的拓扑图如下所示，图中数字表示路由之间链路的费用，OSPF 路由协议将利用( ) 算法计算出路由器u到z的最短路径费用值为(此空作答)
- A.10
- B.4
- C.3
- D.5
正确答案及解析
正确答案
解析
OSPF采用的最短路径优先算法就是基于Dijkstra算法。算法执行过程是首先把起点到所有点的距离存下来找个最短的，然后松弛一次再找出最短的，所谓的松弛操作就是，遍历一遍看通过刚刚找到的距离最短的点作为中转站会不会更近，如果更近了就更新距离，这样把所有的点找遍之后就存下了起点到其他所有点的最短距离。本例中是B。
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