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