Which type of connector is often used in Ethernet networks?

The RJ-45 connector is the standard type used in Ethernet networks due to its design and functionality tailored for data networking. This connector is an 8-pin modular plug, allowing for the transmission of signals through twisted pair cabling, which is predominant in Ethernet applications such as LANs (Local Area Networks).

One of the key factors in its widespread use is its compatibility with various Ethernet standards, including Fast Ethernet and Gigabit Ethernet, making it essential in modern networking environments. The RJ-45 connector supports both the physical connection of cables and the transmission of data over those connections, thus playing a vital role in establishing network connections.

In contrast, the other connectors mentioned—SC, LC, and ST—are primarily designed for fiber optic connections. Each of these connectors serves specific purposes in optical networks, such as connecting fiber optic cables in telecommunications and data networks. However, they do not facilitate the same type of electrical networking as the RJ-45, which is why the RJ-45 is considered the correct answer for Ethernet networks.