Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？（）
- A、UDLD
- B、spanning-tree loopguard
- C、VTP mode transparent
- D、switchport mode desirable
正确答案:A
答案解析:有
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Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？（）
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