Which of these Layer 2 access designs does not support VLAN extensions？（）A、FlexLinksB、loop-free UC、looped squareD、looped triangleE、loop-free inverted U
Which of these Layer 2 access designs does not support VLAN extensions？（）
- A、FlexLinks
- B、loop-free U
- C、looped square
- D、looped triangle
- E、loop-free inverted U
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