Which three of the following network features are methods used to achieve high availability（）
- A、Spanning Tree Protocol（STP）
- B、Delay reduction
- C、Hot Standby Routing Protocol（HSRP）
- D、Dynamic routing protocols
- E、Quality of Service（QoS）
- F、Jitter management
正确答案:A,C,D
答案解析:有
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