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Exam 200-120 Question id=49 Troubleshooting

After the network has converged, what type of messaging, if any, occurs between R3 and R4 routers?

A. No messages are exchanged
B. Hellos are sent every 10 seconds
C. The full database from each router is sent every 30 seconds
D. The routing table from each router is sent every 60 seconds

HELLO messages are used to maintain adjacent neighbors, also when the network is converged.
On broadcast and point-to-point links, default hello packet sends every 10 seconds, on NBMA the default is 30 seconds.