Which statement correctly defines auto-MDIX capability?

• A. It configures an interface for 10/100/1000 Mb/s operation
• B. It automatically configures a straight-through or a crossover Ethernet cable connection
• C. It enables full-duplex operation over copper
• D. It switches the interface on or off automatically

Answer: (B)

Auto-MDIX lets an Ethernet interface automatically detect the type of cable connected and swap the transmit and receive paths as needed. This means you can use either a straight-through or a crossover cable and the devices will still communicate correctly. In older setups, you had to choose the cable type based on what you were connecting, but Auto-MDIX handles that choice behind the scenes by adjusting the TX/RX pairs. It’s not about setting speed or turning the interface on or off, but about making the physical connection flexible so cable type doesn’t matter for basic Ethernet links.