多项选择题

What two choices can you make when redundancy is required from a branch office to a regional office?（）

A. multiple Frame Relay PVCs
B. dualWan links to the regional office
C. dualWan links to another branch office
D. single links - one to the regional office and one to another branch office

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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

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