Which symptom most commonly indicates that two connecting interfaces are configured with a duplex mismatch?

Question:
Which symptom most commonly indicates that two connecting interfaces are configured with a duplex mismatch?

• the spanning-tree process shutting down
• collisions on the interface
• an interface with a down/down status
• an interface with an up/down status

Explanation: A late collision is defined as any collision that occurs after the first 512 bits of the frame have been transmitted. The usual possible causes are full-duplex/half-duplex mismatch, exceeded Ethernet cable length limits, or defective hardware such as incorrect cabling, non-compliant number of hubs in the network, or a bad NIC.

Note: On an Ethernet connection, a duplex mismatch is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex.

Duplex mismatch would not cause the link to be down/down, but would only result in poor performance like increase late collisions on the interface.

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