Discussion
What does the passive command provide to dynamic routing protocols?
Answer: B
Correct answer: Stops an interface from sending periodic dynamic updates but not from receiving updates.
The passive-interface command suppresses outgoing routing advertisements on that interface while leaving the router willing to receive them, and the network remains advertised to the rest of the topology. It is used on interfaces facing hosts or stub segments, where advertising routes wastes bandwidth and exposes the routing domain unnecessarily. Note that in EIGRP and OSPF the effect is stronger, since suppressing hellos prevents adjacencies forming at all.
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