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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) · Cisco
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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
A: Is very CPU intesnive as the roiter is stateful switchover due to being broken B: --> Correct C: DPD --> Relates to DMVPN or GRE tunnels, and not OSPF specifically D: OSPF demand circuit is nice as it refreshed LSA's and Hello's based on demand of the peer; this reduces hellos compared to regular OSPF hellos, BUT DOESN"t help in convergeance. In fact if I'm waiting to send out or refresh a hello based on the demand of my peer, this does noting in helping convergeance of a failure.
B is the best answer, the rest of the answers look inrelevant.
B is correct