Final answer:
Features of distance-vector routing protocols that prevent routing loops include split horizon and poison reverse; they improve network stability and correctness of routing information by preventing misinformation from propagating and advertising an infinite metric for failed routes, respectively.
Step-by-step explanation:
The features of distance-vector routing protocols that can prevent routing loops are split horizon and poison reverse. Both mechanisms work towards improving the stability and correctness of the routing information within a network. Split horizon is a technique that prevents a router from advertising a route through an interface that the router uses to reach the particular subnet. This helps to avoid the possibility of creating loops by not allowing misinformation to propagate back on the path it originally came from. On the other hand, poison reverse is a method that suppresses loops by advertising an infinite metric for a failed route to all routers. This way, routers can quickly update their tables to reflect unreachable destinations. Route summarization, while useful for reducing the size of the routing table and decreasing routing update traffic, does not prevent routing loops in the context of distance-vector protocols.