Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network?（）
- A、802.1d
- B、VTP
- C、802.1q
- D、STP
- E、SAP
正确答案:A,D
答案解析:有
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Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network?（）
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