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Same problem, two answers. Pick a track:
On the job: Two routers' OSPF neighbours are stuck in ExStart and never reach Full.
OSPF moves through Down, Init, 2-Way, ExStart, Exchange, Loading and Full. Memorise the neighbour states for the exam.
Correct. Not enough to fix it.
show ip ospf interface on both ends and fix the interface MTU.ip ospf mtu-ignore only as a stopgap, and say so in the change record.