What is the impact of split-horizon in EIGRP?

The impact of split-horizon in EIGRP is to prevent routing loops by ensuring that routing information is not sent back out the interface from which it was learned. This mechanism enhances the stability and efficiency of the routing process within a network.

When a router receives a routing update on an interface, the split-horizon rule mandates that it will not send that same update back out of that interface. This is crucial for maintaining accurate routing tables and preventing scenarios where a router could mistakenly believe there is a valid path to a network via another router, leading to potential infinite loops in data transmission.

For example, if Router A learns about a route to a certain network from Router B on a specific interface, Router A will not advertise that route back to Router B through the same interface, thereby avoiding any confusion that could arise from reciprocal advertising of routes. This concept is especially important in distance vector routing protocols like EIGRP, which rely on each router sharing its routing knowledge with neighboring routers.

The other options do not accurately represent the purpose of split-horizon. They incorrectly refer to aspects like prioritization of updates, simultaneous communication among routers, or increasing routing table size, which are unrelated to the fundamental operation of split-horizon in the context of EIGRP