You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual ring topology?（）
- A、DynamicTrunking Protocol
- B、Resilient Packet Ring
- C、Synchronous Digital Hierarchy
- D、Coarse Wave Division Multiplexing
正确答案:B
答案解析:有
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