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In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

During high-traffic periods
After broken links are reestablished
When upper-layer protocols require high reliability
In an improperly implemented redundant topology

Correct Answer: In an improperly implemented redundant topology

Explanation:

If the Spanning Tree Protocol is not running on your switches and you connect them together with redundant links, you will have broadcast storms and multiple frame copies.

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