单项选择题
Why would you make a non-backbone area a stub or not-so-stubby area？（）
A. to aggregate routes learned from the ABR B. to lower the cost of routes advertised by the ABR C. to connect a non-contiguous area to the backbone D. to decrease the size of the link-state database in that area
单项选择题 DuringOSPFadjacencyformation，whatstateisarouterinwhenitissendingLSAheaderinformationtoitsneighbor？（）
单项选择题 WhichstatementistrueaboutthefrequencyofOSPFLSAtransmissions？（）
单项选择题 Whattypeofroutercannotexistwithinastubarea？（）
