DNS or Domain Name System, despite its drawbacks, is brilliantly designed for scale. We can learn few lessons from this protocol especially when designing our own apps. This episode of the backend engineering show I go through how DNS works, the pros and the cons and attacks that happened on this system.

0:00 Intro
2:00 Overview DNS
7:40 How DNS works (Details)
15:44 DNS uses UDP
19:30 DNS Poisoning
24:10 is DNS really distributed?
26:30 How Attackers Abuse DNS
30:30 How Chrome overloaded the ROOT servers for 12 years

Resources
https://blog.apnic.net/2020/08/21/chromiums-impact-on-root-dns-traffic/
https://www.cloudflare.com/learning/dns/what-is-dns/
https://www.cloudflare.com/learning/dns/dns-cache-poisoning/
https://blog.cloudflare.com/sad-dns-explained/
https://medium.com/@alex.birsan/dependency-confusion-4a5d60fec610



Fundamentals of Networking for Effective Backends udemy course (link redirects to udemy with coupon)
https://network.husseinnasser.com

Fundamentals of Database Engineering udemy course (link redirects to udemy with coupon)
https://database.husseinnasser.com

Introduction to NGINX (link redirects to udemy with coupon)
https://nginx.husseinnasser.com

Python on the Backend (link redirects to udemy with coupon)
https://python.husseinnasser.com

Become a Member on YouTube
https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join

Arabic Software Engineering Channel
https://www.youtube.com/channel/UChWZsjdoRvZ0T9QWZOD6UpA

🔥 Members Only Content
https://www.youtube.com/playlist?list=UUMO_ML5xP23TOWKUcc-oAE_Eg



🏭 Backend Engineering Videos in Order
https://backend.husseinnasser.com

💾 Database Engineering Videos
https://www.youtube.com/playlist?list=PLQnljOFTspQXjD0HOzN7P2tgzu7scWpl2

🎙️Listen to the Backend Engineering Podcast
https://husseinnasser.com/podcast

Gears and tools used on the Channel (affiliates)

🖼️ Slides and Thumbnail Design
Canva
https://partner.canva.com/c/2766475/647168/10068


Stay Awesome,
Hussein