Which statement describes SPF algorithm in OSPF?

• A. It Analyzes The Topology To Calculate The Shortest Path Tree
• B. It Uses Distance-Vector Updates To Converge
• C. It Uses Monthly Full Updates
• D. It Avoids Any Topology Changes

Answer: (A)

SPF in OSPF is about computing the shortest-path tree from the router’s view of the network topology using the link-state database. Each router receives LSA information to learn the full topology, then runs the SPF (Dijkstra’s algorithm) to determine the best next-hop for every destination. The outcome is a shortest-path tree that guides how packets are forwarded efficiently.

This isn’t based on distance-vector updates, which belong to a different class of protocols. It also isn’t a monthly full update scheme; OSPF updates topology information as changes occur, flooding LSAs to keep everyone’s view in sync. And SPF specifically reacts to topology changes by recomputing the shortest-path tree rather than avoiding changes.