What two features in Cisco switches help prevent Layer 2 loops？（）
- A、UniDirectional Link Detection
- B、Hot Standby Router Protocol
- C、Virtual Router Redundancy Protocol
- D、PortFast
- E、root guard
- F、loop guard
正确答案:A,F
答案解析:有
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What two features in Cisco switches help prevent Layer 2 loops？（）
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