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單項(xiàng)選擇題

Which one of these statements is true of OSPF type 5 LSAs? ()

A. They are used to summarize area routes to other areas.
B. They are used in not-so-stubby areas to propagate external routes.
C. They are used to notify areas of the ASBR.
D. They are flooded to all areas except stub areas (external route).

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