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多項選擇題

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.

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