Chapter 20
1. D. Split horizon causes a router to not advertise a route out of the same interface on which the router was learned. It also causes the router to not advertise about the connected route on an interface in updates sent out that interface. Route poisoning also helps prevent loops, although it does not affect how many routes a router advertises about on an interface. The other two answers are unrelated to loop prevention.
2. D. Route poisoning means advertising the failed route with an “infinite” metric, as opposed to simply ceasing to advertise the route. Of the incorrect answers, SPF defines how link-state protocols calculate and choose routes; hello refers to the messages some routing protocols use to discover and monitor neighboring ...
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