How DNS Works

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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.

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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:

▬▬▬▬▬▬ Want to learn more? 🚀 ▬▬▬▬▬▬
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#microsoft #azure #johnsavillstechnicaltraining #onboardtoazure #cloud

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Thanks for watching!
🤙

NTFAQGuy

Sending this to my buddy - This is for you BranchHammer!! "It isn't DNS, It can't be It was DNS!"

benmitchell

Awesome job demonstrating and explaining DNS, John! I've been doing this a long time, but a great refresher is never a bad thing. I, and many others, appreciate your tireless efforts!

rogerosbu

Love this - reminded me of the old 5-day TCP/IP MOC class I used to teach 20+ years ago. Gosh, I miss that class!!!!

seangalloghly

Felt like studying for the 70-215 exam again back in the day when I saw the Netscape t-shirt 😂 I enjoy reinforcing old topics. Great video.

burropoco

just landed on your channel today... how the hell didn't I knew about it like yesterday!!! Amazing presentation and practical commands to walkthrough the subject.
keep going!

avihayl

Great video, so useful. It would be great if you do more videos like this one, not only focusing on Azure but also explaining the concepts and technologies that are behind. Thanks for the amazing content!!

ernestomartinez

I had a good grasp on DNS already but couldn't help watching the whole video because your content is great 👍

papajohnscookie

Unlike other you kept it quite practical, flow was very clear and without necessary Jargons, loved your voice also. Thank you so much.

raghu.wanshi

Thanks, so many times I had job interviews and they ask me "What is DNS and can you explain how it works?" Now I can in a easier way :)

Chaosmr

What a fantastic Netscape shirt! Love the videos, share where I can and truly appreciate the content you post. Keep up the good work, and have a fantastic day further

TheNelbenjamin

Hey, I just want to give my big thanks and continuous support on this channel. I passed my az700 exam yesterday thanks to your help! God Bless You! and more content please :)

Aldiethegreat

Awesome video mate. DNS, subnets, networking in general has always been the trickiest thing to understand personally. I really appreciate your videos!

stevenstone