How DNS Works - Understanding Domain Name System Resolution and Hierarchy

Explore the inner workings of DNS in this comprehensive 30-minute video tutorial. Delve into the reasons behind DNS necessity, examine the hierarchical structure of DNS, and understand the process of recursive resolution. Learn about the continued importance of using names, the roles of SNI and ClientHello in secure connections, and the significance of caching in DNS operations. Investigate potential security risks like cache poisoning and gain insights into DNS forwarding. With detailed chapters and a whiteboard visual aid, master the fundamentals of how DNS functions in modern networks and web communications.

- Introduction
- Why we need DNS
- The structure of DNS hierarchy
- Recursive resolution
- Still need to use the name
- SNI and ClientHello
- Caching
- Cache poisoning
- Forwarding and summary
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