Which connector is used with twisted-pair cabling in an Ethernet LAN?

Twisted-pair cabling in an Ethernet LAN primarily utilizes the RJ-45 connector. This connector is designed specifically for network applications, which include both wired LAN setups and connections to devices such as computers and routers. The RJ-45 connector has eight pins and supports all four pairs of wires in the twisted-pair cables, ensuring that the required data transmission standards, such as Fast Ethernet or Gigabit Ethernet, are met adequately.

In contrast, other connectors mentioned do not serve this purpose. For instance, RJ-11 connectors are generally used for telephone lines and have only four or six pins, making them unsuitable for Ethernet connections. LC and ST connectors are specific to fiber optic cabling, which operates on a different technology altogether compared to twisted-pair cables. Fiber optic cables use light for data transmission, while twisted-pair cables rely on electrical signals, thus requiring distinctly different types of connectors for their respective applications.