单选题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？（）ADTPBRPRCSDHDCWDMEDWDM
单选题
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
参考解析
解析：
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