Which algorithm does Open Shortest Path First (OSPF) use to build its shortest-path tree when determining the best routes through a network?
Path Vector algorithm
Bellman-Ford algorithm
Dijkstra's Shortest Path First (SPF) algorithm
Ford-Fulkerson algorithm
OSPF is a link-state routing protocol. Each router floods link-state information, and after building a complete topology map, it runs Dijkstra's Shortest Path First (SPF) algorithm to compute the least-cost path to every destination in its link-state database. Algorithms such as Bellman-Ford (used by distance-vector protocols like RIP), Path Vector (used by BGP), and Ford-Fulkerson (a flow-optimization algorithm not used in IP routing) are not used by OSPF.
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