Which cable should a technician use to connect two servers directly for file transfer?

Using a Cat 5e crossover cable is the appropriate choice for connecting two servers directly for file transfer because it allows for the direct communication between the two devices without the need for additional networking equipment, such as a switch or router.

Crossover cables are specifically designed to connect two like devices directly, such as connecting two computers or servers. In this setup, the transmit signals of one device are connected to the receive signals of the other device, enabling proper communication between them.

While Cat 6 straight-through cables can connect devices, they are typically used to connect different types of devices, such as connecting a switch to a server or a computer. Single-mode and multimode fiber cables are usually utilized for longer-distance connections and high-speed data transfer but would be unnecessary and impractical for a direct connection between two servers that are likely within close proximity. Therefore, the Cat 5e crossover cable is the most suitable option for this scenario, facilitating a straightforward file transfer between the two servers.