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?

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

Explanation:
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Cisco 642-874 Exam