Which routing loop avoidance method is used by routers to prevent routing updates from exiting an interface in which they have been learned?

The split horizon method prevents routing updates from exiting an interface in which they have been learned. This stops false information from propagating in the network, which can cause a routing loop. Routing to infinity is a way of advertising a downed route as unreachable because of the number of hops. Route poisoning is similar to routing to infinity as it advertises a downed route as over the routable hop count. Holddowns can help stabilize a network by holding off changes until a specific amount of time has passed.