Which statement about auto-MDIX is true?

• A. It enables a device to automatically configure an interface to use a straight-through or a crossover cable.
• B. It automatically negotiates duplex settings between the two devices.
• C. It automatically fixes incorrect cable lengths.
• D. It requires a crossover cable for two devices to communicate.

Answer: (A)

Auto-MDIX lets an Ethernet interface detect whether the connected device expects to send on the normal TX pair or a different pair, and it automatically swaps the transmit and receive wiring if needed. This means you can use either a straight-through or a crossover cable and the link will still come up. The feature focuses on cable type adaptation, not speed or duplex settings—those are handled by auto-negotiation. It doesn’t fix cable length or force one cable type over another; it simply makes the connection work in either case by adjusting the internal wiring as required.