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Understanding how data travels across the internet is essential for any aspiring network engineer or IT professional preparing for technical exams. This text-based course guides you through the core principles of the network, transport, and application layers, breaking down complex protocols into digestible written explanations. You will transition from basic networking concepts to mastering routing algorithms, congestion control, and modern security practices. What you'll learn: 1. Understand the mechanics of IPv4 and IPv6 addressing, subnetting, and routing protocols. 2. Analyze how TCP and UDP manage data transmission, reliability, and congestion control. 3. Apply network security principles, including cryptography, firewalls, and zero-trust concepts. 4. Explore the fundamentals of Software-Defined Networking (SDN) and its impact on modern infrastructure. 5. Practice solving protocol design problems through written exercises. We begin with fundamental definitions and core terminology before moving systematically through the layers of the network stack. This course is designed for beginners, students, and exam aspirants looking to solidify their theoretical networking knowledge with no prerequisites required. Start reading today to master the core of modern computer networks.