Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual （counter-rotating） ring topology？（）
- A、 DTP
- B、 RPR
- C、 SDH
- D、 CWDM
- E、 DWDM
正确答案:B
答案解析:有
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Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual （counter-rotating） ring topology？（）
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