Discussion
How does split horizon help reduce the count-to-infinity problem in distance vector routing ?
Answer: C
Split horizon works by preventing routers from advertising a route back on the interface from which it was learned.
Count-to-infinity happens when a link fails and two neighbours keep advertising the dead route to each other, each believing the other has a path, so the hop count climbs one step at a time towards infinity (16 in RIP). With split horizon, a router never sends a route back out of the interface it learned it on, so a neighbour cannot feed a stale route back to its source and the two-router loop is broken. Poison reverse is a variant that advertises the route back with an infinite metric.
Split horizon does not stop updates on all ports or disable periodic updates, and the change from hop count to distance has nothing to do with it.
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