How DNS Works
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- Опубликовано: 8 июн 2024
- 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! • RUclips Captions and A... 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:
🔗 github.com/johnthebrit/Random...
▬▬▬▬▬▬ Want to learn more? 🚀 ▬▬▬▬▬▬
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How did you actually GET to this video? Let's find out! Please make sure to read the description for the chapters and key information about this video and others.
⚠ P L E A S E N O T E ⚠
👂 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! ruclips.net/video/v5b53-PgEmI/видео.html for a demo of using this feature.
🤔 Due to the channel growth and number of people wanting help I no longer can answer or even read questions and they will just stay in the moderation queue never to be seen so please post questions to other sites like Reddit, Microsoft Community Hub etc.
🔎 If you are looking for content on a particular topic search the channel. If I have something it will be there!
🕰 I don't discuss future content nor take requests for future content so please don't ask 😇
Thanks for watching!
🤙
my friend works in cloud and is helping me get ready for my comptia a + , he s a big fan of yours and he snet me this to help me understand dns better :P . now im just browsing to see what other goodies you got :))
I searched Bing (company policy) for "John Savill DNS" because I figured if I wanted a good intro video to share with people, that combination of words would get me what I wanted. And I was right.
Sending this to my buddy - This is for you BranchHammer!! "It isn't DNS, It can't be DNS..... It was DNS!"
Yep. Never the network's fault
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.
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!
Glad it was helpful! Thank you.
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!!!!
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!!
Excellent review and great intro for anyone just learning DNS! Thanks John!
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!
Awesome video mate. DNS, subnets, networking in general has always been the trickiest thing to understand personally. I really appreciate your videos!
This video is fantastic! Thanks for cranking out all the good content for us!
Great illustration, thanks for your effort John!
I enjoy your teaching style John. Keep it up
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
love it! Thanks! Awesome content as usual John! Thanks!
I had a good grasp on DNS already but couldn't help watching the whole video because your content is great 👍
I appreciate that!
first like first comment :) one of the most ignored but important Topic Cheers and thanks for deciding to do a session on this John
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 :)
Congrats! 🤙
@@NTFAQGuy thanks John!!!!!
Nice revisiting these concepts. Thanks!
Awesome as always! Thank you!
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 :)
Perfect, nice refresher thanks!
Great material John! Wish you a lot of motivation for new videos :)
This answers a lot of questions. Thank you!!
Glad it was helpful!
Great video sir, thank you so much!
Very useful, thanks John.
Very welcome
This is the best DNS explanation ever! The nslookup demo really helps a lot.
Wow thanks, John as always .. you are awsome !!!💌
You are so welcome
Great explanation!!
Glad it was helpful!
Thanks sir! One of the many bit of "magic" that makes the world work, just imagine if we were all having to remember and type in IP addresses for everything! Thanks for the fantastic, detailed explainer on this that we can point people towards.
You're very welcome!
That shirt brought back so many memories. I want one.
That Netscape shirt is amazing!
Excellent. Thank you.
I needed this....
Dude's turning into The Rock! 😂 Seriously though, great explanation and tracing of a DNS request.
good job, thank you
great info
Thanks for watching!
I am glad you don't have a T-shirt store with the gear you wear or I would be bankrupt. Heading to search for Netscape shirt.
how many people will even know what a NETSCAPE NAVIGATOR WAS ... loved the T-shit :)
the good old days lol
@@NTFAQGuy do you have these t-shirts as Merchs to buy ?
read the video description for info on what I do have.
Ah netscape navigator ~ RIP
i dunno what the hell this is but i find the speaker sexy so I ended up learning dns lol
ROFL
nice shirt
If you started a cooking channel I'd follow that too.
lol, i do want to learn how to bake bread :D
When are you going to write an Azure book?
wrote one years ago on Azure but no real interest in writing another using traditional publishing as too bigger lag and can't update.
@@NTFAQGuy Learnpub allows authors to keep their books up to date but I get youir point. Books are difficult to write and keep up to date. I learn better by reading rather than watching videos, that's why I ask. Cheers
Sounds like Adobe support.
"I'm not sure but let me refer you..."
ROFL
Great refresher