Which two statements are true about bandwidth guarantee？（）
- A、When congestion is present，the priority command doesn’t allow exceeding the allocated rate
- B、When congestion isn’t present，the priority command doesn’t allow exceeding the allocated rate
- C、When congestion is present，the priority command allows exceeding the allocated rate
- D、When congestion isn’t present，the priority command allows exceeding the allocated rate
正确答案:A,D
答案解析:有
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