單項(xiàng)選擇題

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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