单选题Which routers must be configured with the same authentication string when configuring OSPF authentication？（）A all routers on a linkB all routers in an areaC all external OSPF peersD all routers in an OSPF domain
题目
单选题
Which routers must be configured with the same authentication string when configuring OSPF authentication？（）
A
all routers on a link
B
all routers in an area
C
all external OSPF peers
D
all routers in an OSPF domain