单选题On what kinds of networks does OSPF elect a backup designated router?（）APoint-to-point and point-to-multipoint networksBNonbroadcast and broadcast multipoint multicastingCPoint-to-point and multi-access broadcastingDPoint-to-multipoint and multi-access broadcastingENonbroadcast and broadcast multi-access
单选题
On what kinds of networks does OSPF elect a backup designated router?（）
A
Point-to-point and point-to-multipoint networks
B
Nonbroadcast and broadcast multipoint multicasting
C
Point-to-point and multi-access broadcasting
D
Point-to-multipoint and multi-access broadcasting
E
Nonbroadcast and broadcast multi-access
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