Discussion
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?
Answer: D
Correct answer: In an improperly implemented redundant topology
Without STP a redundant topology gives a frame more than one path, so copies circulate and are delivered repeatedly - and because an Ethernet frame carries no time-to-live, nothing stops them. Multiple frame copies, MAC table instability and broadcast storms are the three classic symptoms of a layer 2 loop, and they appear together.
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