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多项选择题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

  • A,D
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