An Introduction to DNS.
An Introduction to DNS demystifies how human-friendly domain names are translated into IP addresses behind the scenes. Commonly know as the back-bone of the internet, you’ll learn how DNS queries work, what different record types do, and how DNS fits into everyday browsing, email, and cloud services. This course is designed to give you confidence with a core internet technology that underpins almost everything online.
Course Curriculum
Chapter 1: What DNS Is and Why It Exists
An introduction to the purpose of DNS and the problems it solves. This chapter explains the relationship between domain names and IP addresses, why DNS is necessary for the internet to function at scale, and where DNS sits in the wider networking picture.
- 1.1Lesson 1.1: Names, Numbers, and the Problem DNS Solves
- 1.2Lesson 1.2: DNS in Everyday Internet Use
Chapter 2: How DNS Works Behind the Scenes
A simple, step-by-step walkthrough of what happens when you type a website address into a browser. Learners are introduced to DNS queries, recursive and authoritative servers, and the basic flow of name resolution — without deep protocol detail.
- 2.1Lesson 2.1: What Happens When You Type a Web Address
- 2.2Lesson 2.2: The Roles of DNS Servers
Chapter 3: Common DNS Records and Real-World Uses
An overview of the most common DNS record types (such as A, AAAA, CNAME, MX, and TXT) and what they are used for in practice. This chapter connects DNS concepts to everyday scenarios like websites, email delivery, and cloud services.
- 3.1Lesson 3.1: Understanding Common DNS Record Types
- 3.2Lesson 3.2: DNS in Websites, Email, and Cloud Services
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