单项选择题
What type of router cannot exist within a stub area？（）
A. ABR B. ASBR C. internal router D. non-backbone router
单项选择题 IfallOSPFroutersonabroadcastnetworkhavethesameOSPFpriority，whatparameterisusedtodeterminethenewBDRatthetimeofaDRfailure？（）
