In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN（）。A、during high traffic periodsB、after broken links are re-establishedC、when upper-layer protocols require high reliabilityD、in an improperly implemented redundant topologyE、when a dual ring topology is in use
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN（）。
- A、during high traffic periods
- B、after broken links are re-established
- C、when upper-layer protocols require high reliability
- D、in an improperly implemented redundant topology
- E、when a dual ring topology is in use
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