How DNS Works

A look at something you’ve just used, DNS!

Note in my demo I request just the child part of the FQDN that the name server is authoritative for to avoid any cached entries return the final resolution too soon but as I said in the whiteboard the full FQDN is asked each time and you just get referred to the next nameserver 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 settings! https://youtu.be/v5b53-PgEmI for a demo of using this feature.

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▬▬▬▬▬▬ C H A P T E R S ⏰ ▬▬▬▬▬▬
0:00 – Introduction
0:12 – Why we need DNS
2:07 – The structure of DNS hierarchy
6:15 – Recursive resolution
16:34 – Still need to use the name
18:55 – SNI and ClientHello
22:12 – Caching
25:05 – Cache poisoning
28:05 – Forwarding and summary

Correction:
19:10 syn syn-ack ack

▬▬▬▬▬▬ K E Y L I N K S 🔗 ▬▬▬▬▬▬
► Whiteboard:
🔗 https://github.com/johnthebrit/RandomStuff/raw/master/Whiteboards/HowDNSWorks.png

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