Internet of Things (IoT) Practice Exam 2025 – Comprehensive Prep Resource

The correct choice highlights that hydrogen cables and electron ionisation are not currently recognized as viable media for data communication in typical network and telecommunications infrastructures. The common methods for data transmission, such as wireless/electromagnetic waves, fibre optics using pulses of light, and copper cables transmitting electrical signals, represent established technologies that facilitate communication across various distances and applications.

Wireless communication utilizes electromagnetic waves to transmit data to and from devices without physical connections, making it essential for mobile communication and IoT devices. Fibre optics rely on light pulses to carry data at high speeds over long distances with minimal loss, ideal for high-bandwidth applications. Copper cables, traditionally used in networking, conduct electrical signals and are still prevalent in various settings, including home and office networks.

In contrast, the mention of hydrogen cables and electron ionisation suggests a theoretical or experimental approach rather than a practical application. Hydrogen has not been adopted as a standard medium for data transmission in the same way that light or electrical signals are. Therefore, this option does not align with the recognized technologies currently in use for effective data communication.