单项选择题
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
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单项选择题
You are the network consultant from Cisco.com. Please point out which Layer 2 access designs does not support VLAN extensions?（）
A. Flex Links
B. loop-free U
C. looped square
D. looped triangle
