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Which of the following is NOT a valid mechanism to prevent routing loops?
Split horizon
Route poisoning
Hold down timers
Gateway protocol
Gateway protocol performs routing between separate autonomous systems. The three mechanisms which prevent routing loops used in routing information protocol are split horizon, route poisoning, and hold timers. Hold down timer works by having each router start a timer when they first receive information about a network that is unreachable. Split horizon is a method of preventing a routing loop in a network. The basic principle is simple: Information about the routing for a particular packet is never sent back in the direction from which it was received. Route poisoning is a method to prevent a router from sending packets through a route that has become invalid within computer networks.
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