單項(xiàng)選擇題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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1.單項(xiàng)選擇題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


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