What does RIPv2 use to prevent routing loops?
1.CIDR
2.Split horizon
3.Authentication
4.Classless masking
5.Holddown timers
Answer: C
RIPv2 uses the same timers and loop-avoidance schemes as RIPv1. Split horizon is used to stop an update from being sent out the same interface it was received on. Holddown timers allow time for a network to become stable in the case of a flapping link.