Which technology is often used to extend the range of a network?

The technology that is often used to extend the range of a network is a repeater. A repeater works by receiving a signal, amplifying it, and then retransmitting it, effectively regenerating the signal over greater distances. This is particularly useful in networking scenarios where the distance between devices may cause signals to weaken, which can lead to data loss or reduced connectivity. Repeaters are commonly used in various types of networks, including wired and wireless systems, to ensure that data can be transmitted over longer distances without degradation.

In contrast, modulators are primarily used to convert digital signals into analog so they can be transmitted over various media, not specifically for extending range. Filters serve to eliminate unwanted frequencies or signals in a network without extending its reach. Transponders, while they can relay signals, are typically used for communication between devices and may not specifically target range extension in the same way a repeater does. Thus, the role of the repeater in enhancing the extent of network coverage is what makes it the correct choice.