BIHAR ICT LAB

Cybersecurity Essentials: Protecting Your Data and Devices in the Digital Age 1. Introduction In today's connected world, our daily activities—from studying online and sending emails to banking and social networking—rely heavily on internet access. However, as digital connectivity grows, so do the risks associated with online threats. Cybersecurity is the practice of protecting systems, networks, programs, and personal data from digital attacks, unauthorized access, and damage. For school students and computer lab users, developing strong cyber hygiene habits is essential to protect digital identities and hardware. 2. Common Cyber Threats Every Student Should Know Understanding potential risks is the first step toward effective digital protection:  * Malware (Malicious Software):    * Viruses & Worms: Malicious code that attaches to files or self-replicates across networks to corrupt data or slow down computers.    * Trojans: Deceptive software disguised as ...

Computer Memory Explained: Understanding RAM, ROM, and Storage Devices 1. Introduction Every action performed on a computer—from opening an application to saving a document—depends directly on computer memory. Computer memory is any physical device capable of storing information temporarily or permanently. Just like the human brain uses short-term memory for active calculations and long-term memory for stored facts, computers utilize a hierarchy of memory types to balance high processing speed with permanent data retention. 2. Primary Memory vs. Secondary Storage Computer memory is broadly divided into two primary categories:  * Primary Memory (Internal / Main Memory):    * Directly accessible by the CPU via the system memory bus.    * Faster, lower-capacity storage used exclusively for running programs and active operating system processes.    * Examples: RAM (Random Access Memory) and ROM (Read-Only Memory).  * Secondary Storage (Auxiliary / Mas...

Fundamentals of Computer Networking: Understanding LAN, WAN, and the Internet 1. Introduction A Computer Network is a collection of two or more computing devices connected to share resources, exchange files, and facilitate communication. Shared resources can include physical hardware, such as printers and storage drives, or digital services, such as internet access and centralized databases. From a single school computer lab to global cloud infrastructure, modern digital communication relies on robust networking protocols and physical architectures. 2. Major Types of Networks Computer networks are categorized primarily by the geographical area they span:  * LAN (Local Area Network):    * Geographical Span: Limited to a localized physical area, such as a single classroom, an ICT lab, or an office building.    * Data Transfer Speed: High transmission rates, typically ranging from 100 Mbps to 1 Gbps or higher.    * Ownership: Privately owned and managed ...