Which type of cable must you use to connect to device with mdi interfaces?
To connect two devices with MDI (Medium Dependent Interface) interfaces, you need to use a crossover cable.
MDI interfaces are used to connect network devices, such as switches and routers, to other devices, such as computers or other network devices. MDI interfaces are designed to transmit and receive data on the same pins, meaning that they use the same pins for both sending and receiving data. This is different from MDIX (Medium Dependent Interface Crossover) interfaces, which use different pins for sending and receiving data.
When connecting two devices with MDI interfaces, you need to use a crossover cable. A crossover cable is a type of Ethernet cable that is specifically designed to connect two devices of the same type, such as two switches or two routers. The wiring in a crossover cable is crossed over so that the transmitting and receiving pins on one end of the cable are connected to the receiving and transmitting pins on the other end of the cable.
On the other hand, a straight-through cable is used to connect devices with different types of interfaces, such as a computer to a switch or a router. The wiring in a straight-through cable is not crossed over, meaning that the transmitting and receiving pins on one end of the cable are connected to the same pins on the other end of the cable.
A rolled cable is an older type of cable that is no longer commonly used. It is similar to a crossover cable, but the pins are arranged differently. A crossed cable is another name for a crossover cable, so this option is incorrect.
Therefore, the correct answer is B. crossover.