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、 DTPB、 RPRC、 SDHD、 CWDME、 DWDM
题目
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
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参考答案和解析
正确答案:B