Domain Name System (DNS) Fundamentals for Web and Networking

Every time you enter a URL into a browser, a complex system works behind the scenes to connect you to the right server. Understanding the Domain Name System (DNS) is essential for anyone pursuing a career in web development, networking, or cybersecurity. This course provides a clear, text-based path to understanding how domain names are resolved, managed, and protected in a modern internet environment. You will gain a comprehensive understanding of the internet's directory, moving from basic terminology to the technical configurations that keep the web running. By the end of this course, you will be able to explain the lifecycle of a DNS query and identify the security measures necessary to prevent network attacks. What you'll learn: - Understand the hierarchy of the DNS root, TLD, and authoritative name servers - Configure essential record types including A, CNAME, MX, and TXT records - Analyze the step-by-step resolution process from the local resolver to the global network - Apply security principles like DNSSEC to protect against cache poisoning and spoofing - Explore modern privacy standards including DNS over HTTPS (DoH) and DNS over TLS (DoT) - Practice diagnosing domain connectivity issues through written technical scenarios The course begins with foundational definitions and the history of naming systems before moving into practical configuration and advanced security protocols. You will progress through detailed explanations and logic-based exercises designed to build a solid foundation in network infrastructure. This course is designed for beginners with no prior networking experience who want to understand the core mechanics of the web. Start building your knowledge of the internet's infrastructure today.