DNS and URLs: Foundational Networking for Web Developers

Every time you type a web address, a complex network of systems works behind the scenes to deliver the page. Understanding how DNS and URLs function is a non-negotiable skill for anyone building, deploying, or troubleshooting modern web applications. This course takes you from absolute beginner to confidently navigating domain name resolution and web address anatomy. You will learn the mechanics of how the internet routes traffic, how to query domain servers, and how to structure secure, accessible URLs. What you'll learn: - Understand the core architecture of the Domain Name System (DNS) and how nameservers resolve queries. - Deconstruct the anatomy of a URL, including protocols, subdomains, paths, and query parameters. - Practice querying domain records using industry-standard terminal tools like dig and nslookup. - Configure essential DNS record types such as A, AAAA, CNAME, MX, and TXT. - Explore modern security enhancements including DNS over HTTPS (DoH) and basic DNSSEC concepts. - Analyze how modern browsers parse web addresses to establish secure HTTPS connections. Starting with fundamental terminology and basic networking concepts, this text-based guide transitions into practical lookup exercises and real-world domain configuration scenarios. This course is designed for aspiring web developers, system administrators, and tech-curious beginners with no prior networking experience. Start reading today to master the underlying architecture of the web.