Discussion
In which Routing Method do all the routers have a common database ?
Answer: B
All the routers share a common database in link state routing.
In link state routing each router floods information about its links to all the others, so every router builds the same map of the network, the link state database, and runs a shortest path algorithm on it, as in OSPF. In distance vector routing (A) each router knows only what its neighbours tell it. 'Link vector' (C) is not a recognised routing method, and Dijkstra's method (D) is the algorithm that the link state router runs, not the name of a routing method with the shared database.
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