Which action does split horizon use to reduce incorrect routing information?

Question:

Which action does split horizon use to reduce incorrect routing information?

• It limits the number of hops a packet can traverse through the network before the packet should be discarded.
• It marks routes as unreachable in routing updates sent to other routers.
• It prevents routers from accepting higher cost routes to networks previously marked as inaccessible before the timer expires.
• It prevents routers from advertising a network through the interface from which the update came.

Explanation: Advertising a route back to the originating router is known as reverse route. Reverse routes waste network resources, causing routing loops. Split horizon prevents the advertisement of reverse routes.

Exam with this question: CCNP Enterprise: Advanced Routing (Version 8.0) – Routing Concepts and EIGRP Exam