单项选择题
A.A
B.B
C.C
D.D
单项选择题 Which OSPF parameter controls the amount of time it takes to determine if a neighbor has failed?（）
单项选择题 Which OSPF router will advertise a Type 2 network LSA for a broadcast network segment?（）
单项选择题 Which OSPF router type summarizes network advertisements from one OSPF area into another?（）
