To connect two routers directly, which cable is used?

To connect two routers directly, which cable is used?

• A. Straight-through cable
• B. Crossover cable
• C. Fiber optic
• D. Coaxial

Answer: (B)

The main concept here is how Ethernet cables align the transmit and receive pairs between two network devices. When two devices have the same type of port (like two routers), you typically connect their transmit pins to the other device’s receive pins. A crossover Ethernet cable is wired so that the pins carrying outgoing signals on one end land on the pins that carry incoming signals on the other end. This lets the two routers establish a link directly without an intermediary device. In practice, this is the classic way to connect similar devices directly. Some modern hardware supports Auto-MDIX, which can automatically adjust and allow a straight-through cable to work as well, but the traditional and correct choice for a direct router-to-router link is a crossover cable. Fiber optic would require appropriate transceivers and fiber cabling, and coaxial isn’t used for standard Ethernet router-to-router connections.

The main concept here is how Ethernet cables align the transmit and receive pairs between two network devices. When two devices have the same type of port (like two routers), you typically connect their transmit pins to the other device’s receive pins. A crossover Ethernet cable is wired so that the pins carrying outgoing signals on one end land on the pins that carry incoming signals on the other end. This lets the two routers establish a link directly without an intermediary device.

In practice, this is the classic way to connect similar devices directly. Some modern hardware supports Auto-MDIX, which can automatically adjust and allow a straight-through cable to work as well, but the traditional and correct choice for a direct router-to-router link is a crossover cable. Fiber optic would require appropriate transceivers and fiber cabling, and coaxial isn’t used for standard Ethernet router-to-router connections.