Which three are correct about L2TP tunnel selection algorithms? ()(Choose three.)
- A、Failover between preference levels is the default.
- B、One algothrim is failover within a preference level.
- C、Failover across all preference levels is the default.
- D、One algothrim is failover between preference levels.
- E、One algothrim is failover across all preference levels.
正确答案:A,B,D
答案解析:有

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