Which feature of dynamic routing protocols helps to prevent routing loops?

The feature of dynamic routing protocols that helps to prevent routing loops is split horizon. This technique works by prohibiting a router from advertising a route back to the same interface from which it was learned. By doing this, it effectively prevents routing loops that can occur when routing information is propagated in cycles between routers. For instance, if Router A learns about a route to a destination from Router B, Router A will not send that route back to Router B. This simple restriction reduces the potential for endless routing loops and helps maintain a stable routing environment.

Convergence refers to the process where all routers in a network become aware of all routes in the topology after a change occurs, but it does not specifically target the prevention of loops. The concept of "Rip count" is not a standard method related to loop prevention; it may be referencing a maximum number of hops in RIP but this does not directly pertain to preventing loops. Route summarization does help in reducing the size of routing tables and can contribute to network efficiency but is not a specific loop-prevention mechanism. Therefore, split horizon remains the key feature designed to restrict routing updates from being sent back to the origin point, ensuring a more stable routing environment and mitigating the risk of loops.