How DNS works

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A look at something you just used: DNS!

Note that in my demo I only query the child part of the FQDN for which the name server is authoritative to prevent cached entries from returning the final resolution too quickly, but as I said on the whiteboard, every time to get the full FQDN will be requested and you will simply be redirected to the next name server down.

I have manually updated the captions to be as accurate as possible. Enable the subtitles and from there you can translate to your native language via the auto translate feature in the settings! https://youtu.be/v5b53-PgEmI for a demo of how to use this feature.

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CHAPTERS
0:00 – Introduction
0:12 – Why we need DNS
2:07 – The structure of the DNS hierarchy
6:15 – Recursive resolution
16:34 – Still need to use the name
6:55 PM – SNI and customerHello
22:12 – Caching
25:05 – Cache poisoning
28:05 – Forwarding and summary

Correction:
19:10 syn-acack

KEY LINKS
Whiteboard:
https://github.com/johnthebrit/RandomStuff/raw/master/Whiteboards/HowDNSWorks.png

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