On which types of network will OSPF elect a backup designated router?（）
- A、point-to-point and multiaccess
- B、point-to-multipoint and multiaccess
- C、point-to-point and point-to-multipoint
- D、nonbroadcast and broadcast multipoint
- E、nonbroadcast and broadcast multiaccess
正确答案:E
答案解析:有
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