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-tree 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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