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單項(xiàng)選擇題

What is the function of the helper router during a restart event in OSPF?()

A. Sends Rapid Hellos to the restarting router.
B. Maintains Adjancency with restarting router.
C. Sends periodic DD packets to the restarting router.
D. Floods Type 9 LSAs to all routers indicating a restarting event.

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