How DNS Works
ฝัง
- เผยแพร่เมื่อ 25 มิ.ย. 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! • TH-cam 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! th-cam.com/video/v5b53-PgEmI/w-d-xo.html for a demo of using this feature.
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🔎 If you are looking for content on a particular topic search the channel. If I have something it will be there!
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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
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 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.
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.
This video is fantastic! Thanks for cranking out all the good content for us!
Excellent review and great intro for anyone just learning DNS! Thanks John!
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!!
Awesome video mate. DNS, subnets, networking in general has always been the trickiest thing to understand personally. I really appreciate your videos!
Great illustration, thanks for your effort John!
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!!!!
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 enjoy your teaching style John. Keep it up
I had a good grasp on DNS already but couldn't help watching the whole video because your content is great 👍
I appreciate that!
Nice revisiting these concepts. Thanks!
Awesome as always! Thank you!
Great material John! Wish you a lot of motivation for new videos :)
Perfect, nice refresher thanks!
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!!!!!
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 :)
That Netscape shirt is amazing!
This answers a lot of questions. Thank you!!
Glad it was helpful!
Wow thanks, John as always .. you are awsome !!!💌
You are so welcome
Great video sir, thank you so much!
Very useful, thanks John.
Very welcome
I needed this....
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!
Great explanation!!
Glad it was helpful!
Dude's turning into The Rock! 😂 Seriously though, great explanation and tracing of a DNS request.
That shirt brought back so many memories. I want one.
first like first comment :) one of the most ignored but important Topic Cheers and thanks for deciding to do a session on this John
This is the best DNS explanation ever! The nslookup demo really helps a lot.
Excellent. Thank you.
great info
Thanks for watching!
good job, thank you
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
If you started a cooking channel I'd follow that too.
lol, i do want to learn how to bake bread :D
nice shirt
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