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Routing information protocols use hop counts as a routing metric. There are three mechanisms used to prevent routing loops. Which ONE involves a protocol or mechanism which prevents a router from sending out information about a route back out to the same interface from which the original route was learned?
Split horizon
Hold down timers
Route poisoning
Open shortest path
Split horizon is a mechanism used to prevent routing loops in which the router is prevented from sending information back on a route to the original interface which the route was originally learned. EDIT: Great question, but should it be on a CISSP practice test? why is this a combo box question with a SINGLE answer?
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