Introduction to Computer Networks: Architecture, Routing, and Diagnostics

Every digital interaction relies on a complex web of connected devices. Understanding how data travels across networks is the first step toward a career in IT, system administration, or cloud engineering. This text-based course guides you from absolute beginner to confidently understanding network architecture. You will learn how data packets are structured, how routing works, and how to identify and resolve common connectivity issues using standard command-line tools. What you'll learn: - Understand the foundational OSI and TCP/IP models and how data flows through each layer. - Master IP addressing, subnetting, and the core differences between IPv4 and IPv6. - Analyze routing and switching behaviors to understand how data reaches its destination. - Diagnose network connectivity issues using standard command-line diagnostic tools. - Explore modern security concepts, including zero-trust network basics and secure protocols. The course starts with essential terminology and structural models before moving into practical IP addressing and routing concepts. You will progress through written scenarios and configuration walkthroughs that simulate real-world troubleshooting. Designed entirely for beginners, this course requires no prior networking experience or technical background. Start reading today to build your core networking knowledge.