Information and Communication Technology

Introduction to ICT and Data Transmission

Information and Communication Technology (ICT) is the backbone of modern data processing, combining telecommunications and computers. At the core of ICT is the transmission of information through information communication channels, which include radio waves, microwaves, and fiber optics. Data in digital systems is represented using binary signals (0s and 1s). To transmit this data over long distances, modulation is used, where a low-frequency message signal is superimposed onto a high-frequency carrier wave.

Transmission Lines and Storage Devices

For board exams, students must clearly distinguish between the types of transmission lines used in networking and telecommunications: twisted pair cables, coaxial cables, and fiber optic cables. Fiber optics rely on the principle of total internal reflection to transmit light signals with extremely high speed and bandwidth. Additionally, storing this vast amount of data requires reliable memory devices. Primary storage (like RAM and ROM) and secondary storage devices—such as hard disk drives (HDDs), solid-state drives (SSDs), flash memory, and compact discs (CDs)—are frequent topics for short and long conceptual questions.

The Internet, Email, and Data Safety

The Internet is a global system of interconnected computer networks that relies on standard communication protocols. Essential internet services include the World Wide Web (WWW), electronic mail (email), and file transfer systems. In exams, you are often expected to define the basic architecture of email and the role of web browsers and search engines. Furthermore, with the rise of digital dependency, understanding the security risks—such as hacking, viruses, and data theft—along with preventive measures like encryption and secure backups, is a vital concept heavily tested in both objective and subjective portions.