After replacing a PC, the switchport logs show a continuous flapping of MAC addresses. What is the most probable reason for this behavior?
Answers
AA speed mismatch
BA duplex mismatch
CA Layer 2 loop due to disabled spanning tree
DA faulty NIC on the PC
Correct answer: C — A Layer 2 loop due to disabled spanning tree
MAC address flapping is a classic symptom of a Layer 2 loop, where broadcast frames circle endlessly and cause the switch to continually update its MAC address table with different ports for the same MAC.
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