Which of the following accurately describes a characteristic of electrical impulses?

A characteristic of electrical impulses is that they are used in metal wire cabling. Electrical impulses travel through conductive materials, such as copper wires, which are commonly used in various types of networking cabling, including twisted pair and coaxial cables. This transmission method is effective for carrying data across short to moderate distances, making it suitable for local area networks (LANs) and other networking applications where metal cabling is used.

Metal wire cabling conducts electrical signals through the physical properties of the metal, allowing devices connected via this cabling to communicate effectively with one another. It's important to note that while this medium can experience attenuation (signal loss) over long distances, it is still a fundamental characteristic of how electrical impulses operate in wired networks.

The other options do not accurately describe characteristics of electrical impulses as related to networking. For instance, while fiber optics do enable high-speed connections, they use light signals rather than electrical impulses. Electrical impulses also require physical connections, contrary to the suggestion that they can transmit data without any physical link between devices.