Your network is suffering from regular outages. After troubleshooting， you learn that the transmit lead of a fiber uplink was damaged. Which two features can prevent the same issues in the future？（）
- A、root guard
- B、loop guard
- C、BPDU guard
- D、UDLD
- E、BPDU skew detection
正确答案:B,D
答案解析:有
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