多项选择题

Under which two circumstances should Spanning Tree Protocol be implemented？（）

A. to ensure a loop-free topology
B. to protect against user-side loops
C. when a VLAN spans access layer switches
D. for the most deterministic and highly available network topology
E. because of the risk of lost connectivity without Spanning Tree Protocol

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Under which two circumstances should Spanning Tree Protocol be implemented？ （）

Under which two circumstances should Spanning Tree Protocol be implemented？（）