Answer B,C is correct: B. when the cable length limits are exceeded; C. when one side of the connection is configured for half-duplex. The answer follows directly from normal Cisco device behavior and the wording of the scenario. Cisco CCNA 200-301 v1.1 includes this under Network Fundamentals, where the exam expects engineers to recognize the device behavior that actually produces the required outcome. The question is best solved by reading the operational clue rather than choosing a familiar acronym. The other choices are either adjacent technologies, wrong-layer functions, or settings that would not produce the stated result. In a production network, the wrong choice would normally create an outage, leave a management or security gap, or send troubleshooting toward the wrong subsystem. The selected answer is the one that matches the control-plane, data-plane, wireless, security, services, or automation mechanism described in the question. That is why it remains the verified answer for this item.
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