Computer Networks Fundamentals

Understanding how computer networks function is the backbone of modern technology, yet learning the underlying protocols can often feel overwhelming. This text-only course breaks down complex networking concepts into digestible, structured written modules. You will start with the foundational terminology, the OSI and TCP/IP models, and the physical layer before moving on to practical routing and security concepts. Build a strong foundation in how data travels across the globe. What you'll learn: Understand the layered architecture of the OSI and TCP/IP reference models; Analyze the protocols of the transport layer, including TCP and UDP flow control; Explore IP addressing, subnetting, and modern routing algorithms; Configure basic network security parameters and understand modern zero-trust security concepts; Practice troubleshooting common network connectivity issues using standard command-line tools. This course guides you step-by-step from basic physical signals to complex application-layer protocols, ensuring you grasp both theoretical models and real-world networking scenarios. This course is designed specifically for beginners, IT students, and aspiring systems administrators with no prior networking experience. Start reading today to demystify how the internet and local networks operate.