单项选择题
Which statement is true about the frequency of OSPF LSA transmissions？（）
A. They are configured per OSPF area. B. They are configured per virtual router. C. They are configured per OSPF process. D. They are configured per OSPF interface.
单项选择题 Whattypeofroutercannotexistwithinastubarea？（）
单项选择题 IfallOSPFroutersonabroadcastnetworkhavethesameOSPFpriority，whatparameterisusedtodeterminethenewBDRatthetimeofaDRfailure？（）
