多选题Under which two circumstances should Spanning Tree Protocol be implemented？ （）Ato ensure a loop-free topologyBto protect against user-side loopsCwhen a VLAN spans access layer switchesDfor the most deterministic and highly available network topologyEbecause of the risk of lost connectivity without Spanning Tree Protocol
多选题
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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