Under which two circumstances should Spanning Tree Protocol be implemented？ （）A、 to ensure a loop-free topologyB、 to protect against user-side loopsC、 when a VLAN spans access layer switchesD、 for the most deterministic and highly available network topologyE、 because of the risk of lost connectivity without Spanning Tree Protocol
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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