Which three Layer 2 access designs have all of their uplinks in an active state？（）
- A、Flex Links
- B、loop-free U
- C、looped square
- D、looped triangle
- E、loop-free inverted U
正确答案:B,C,E
答案解析:有
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Which three Layer 2 access designs have all of their uplinks in an active state？（）
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