Overview of DNS Fundamentals by Russ White
Course Introduction: Mastering DNS – The Hidden Backbone of the Internet
Have you ever wondered what really happens when you type google.com into your browser?
Before any website loads, before any email is sent, before any app works — there is one system that makes it all possible: DNS (Domain Name System).
DNS is often called “the phonebook of the Internet”. Without it, the Internet as we know it would not work. Websites, apps, emails — all would break. That’s why every network engineer, system admin, and IT professional must understand DNS deeply.
In this course, you will learn:
DNS Introduction → What DNS is and why it’s so important.
DNS Operation → How queries and responses actually work step by step.
DNS Records → A, AAAA, MX, CNAME, DNAME and more — what they mean and when to use them.
Information Leaking → How DNS can reveal sensitive data and what to do about it.
DNS Transport → The protocols behind DNS (TCP, UDP, DoH, DoT, QUIC)
Diagnosing DNS → Tools and methods to troubleshoot DNS issues in real life.
By the end of this course, you won’t just “know DNS” — you’ll be confident to design, secure, and troubleshoot it like a professional.
Enrolling in this course gives you exclusive access to our vibrant study group, where you can engage in enriching technical discussions, collaborate on labs, and get answers to your questions from peers and experts. This collaborative environment sets us apart from other training providers, who often offer solitary, independent study options. By joining our study group, you'll enhance your learning experience through collective problem-solving, hands-on lab work, shared insights, and a supportive community. Elevate your learning journey with us and thrive in a network of like-minded learners!
