Everything You Need to Know About DNS: Crash Course System Design #4

[@angularfreelancer923]

I literally got tears of joy by the end of the video. Do you know why? my brain realised it had a quality learning for 5:44 minutes. Hard to imagine the efforts behind making such a wonderful session.

[@matthewsokolik5326]

This is the best explanation on DNS I have seen. Thank you for such a presentation.

[@phoenix-tt]

Didn't know that you could shorten TTL before changing DNS records to ease the transition. Very valuable information, thank you!

[@testbesthostingtestbesthos557]

it will be applied for future updates, not for first update, because middle servers will still wait till their old TTL expire.

[@victornoagbodji]

This is one of the best explanations of how DNS works I have seen in a while. Thanks so much 😊🙏

[@frozenheart4855]

check computerphile channel

[@felipeschossler]

Your skill for simplify things is not from this world. Thank you, I see you! 🙏

[@krrishh7]

[non-tech-comment] I have been watching contents from this channel for very long. Always felt like he had a familiar face. Today, I just realised he had a striking resemblance with the Keymaker in matrix, (he is a more happier version😄) 🔑❤

[@harshvardhansingh4830]

this is a GOAT channel . The production quality is off charts

[@AMEER-114-]

Message recieved... CANT RESOLVE DNS FROM ANDROID APPS What do I need to do to fix this?

[@harrisonyg]

I have seen your works from the beginning, I appreciate your hard work, thank you for making this to be more understandable.

[@ReflectionOcean]

DNS translate domain names to IP addresses. It's hierarchical and de-centralized.

[@anjalits6228]

Thankyou this is very useful to me

[@ingridfuller]

Excellent video on how DNS works. Great job!

[@alirezashafaie7394]

best channel on system design

[@davidrodriguezramirez1941]

Incredibly valuable information, especially the part about changing the TTL way before really changing the ip so it can propagate on time

[@AMEER-114-]

Message recieved... CANT RESOLVE DNS FROM ANDROID APPS What do I need to do to fix this?

[@mohitggarg]

Great video, very informative 4 quick questions.... 1. Who owns the ip address of DNS resolver 2. Browser sends http request which is stateless, so every time it will go to check the dns resolver 3. How browser solves this quickly can you elaborate this much more. 4. Who will update the ip addresses of TLD name servers

[@Ud-Life]

Very informative and easy to understand explanation. Please keep posting such content.

[@rongrongmiao3018]

Great! You should also cover different dns record types like a record, mx record, cname, Alias etc

[@herbpeach]

thank you for your fantastic video! the audio and video information together was superb. thank you so much and i will highly recommend this video to others

[@ManishKak]

the editing on this video is top notch.. thanks!

[@nan_do_rocha]

Amazing video! Congratulations!

[@Zmey5656]

Thank you. It's simple explanation for me, but without understand all system will be too difficult understand all system for junior or intern.

[@saritachaudhary5843]

I love this channel!

[@PHINIxXGaming]

What A Great Explanation, Wow

[@Joeyxyx]

BBG never disappoints!

[@AMEER-114-]

Message recieved... CANT RESOLVE DNS FROM ANDROID APPS What do I need to do to fix this?

[@Hypocrisy.Allergic]

This was amazing!

[@PeranMe]

Thanks, this helped me out!

[@RayanMADAO]

Amazing 👏 Short enough to keep my attention and low level enough to be interesting and informative

[@DunOpondo]

Awesome illustrations, keep it up 👍🏿

[@macanthony1982]

this was a fire explanation....🔥🔥🔥🔥🔥

[@IAMDEH]

Great video, I appreciate the free content and I'm looking forward for more!

[@Spider-Man_67]

Thanks for the Info, man

[@fighterifght]

Thank you for explaining in a nutshell

[@anu8928]

Awesome explanation!!

[@davidgeeraerts9311]

Very nice! Thank you for your efforts.

[@vadud3]

Really enjoy your youtube articles. Would you cover the difference between recursive and iterative dns query may be on another youtube episode. Thank you!

[@trailerhaul8200]

Love your channel

[@mathewsjose1990]

Good explanation !

[@AMEER-114-]

Message recieved... CANT RESOLVE DNS FROM ANDROID APPS What do I need to do to fix this?

[@ajitoriginal]

Very well explained

[@AMEER-114-]

Message recieved... CANT RESOLVE DNS FROM ANDROID APPS What do I need to do to fix this?

[@avii0904]

Amazing video! I’m a bit confused, though. Are DNS resolver, local DNS, and client DNS all the same?

[@Soumik.Biswas]

Thanks for sharing.

[@DK-ox7ze]

I am surprised that there was no mention of ICANN in the video. Where does ICANN stand in the DNS resolution? Are you referring to ICANN as Root resolver here?

[@mrsmith-lp5lg]

Amazing videos! What library/tool are you using to make the videos? Pleeease, share.

[@netto_info]

Perfect! Thank you!

[@kevinfredericks2335]

you make great videos

[@AleksandarT10]

Great video!

[@mePrafull]

thank you!

[@bntheyoutube]

Fantastic!!!

[@IsanHawke]

Great video. What did you use to create the animation? Thank you in advance.

[@That_Guy_You_Know]

Missed a few caches: browser(mentioned) --> OS --> router --> then ISP and so on. Otherwise this was a fantastic explanation and I always love your animations! What software or tool do you use for the animations?

[@AMEER-114-]

Message recieved... CANT RESOLVE DNS FROM ANDROID APPS What do I need to do to fix this?

[@victorh.torres2713]

Amazing info, thanks. My concern is, there are a lot of request only for translate the domain to a ip address and after of that, the browser will can get the resources for that ip address. I know that there is running in a fraction of seconds, but is there a better way today instead to add in more dns server around the world? Regards.

[@ashwinsridhar8513]

Very nice video but can u tell me where dns resolver and dns server will be located???

[@michalk2497]

awesome!

[@FelizardoCoxe]

great

[@muddukrishnahm6581]

May i ask which tool you have used to make this animation, It's very impressive.

[@evanbzzz]

I love the way you explain things you think you can do a playlist on dynamic programming ? Related to getting a job on an approach to solve leetcode or hackerank questions I think it may help us uk people apply for jobs thanks again!

[@samglima]

they should be playing this video in the universities

[@AMEER-114-]

Message recieved... CANT RESOLVE DNS FROM ANDROID APPS What do I need to do to fix this?

[@NathanSubramani]

Will we be able to capture the redirects happening between resolver, root, TLD servers in our browser developer tools network tab??

[@vivek7231]

What is the sotware that you use for editing the videos and how are you gathering different images and flowcharts of design?

[@egor.okhterov]

I don't understand how does an operating system participate in domain name resolution except for providing "open()" and "socket()" system calls to open files and do network communication using sockets?

[@tuanvuphan7454]

can you do iptables next?

[@Tarun_Kumar_bhu]

I have a quick question. What is the logic to identify the country from the IP address.

[@waikittsang4825]

Can you explain DNSSEC too?

[@KeerthiReddyKolan]

I did not understand the TTL part. Can someone explain it in detail?

[@AledkHarry-v2u]

Mitchel Wall

[@23jwhetstone]

Why would a network be connected to a FC00 dns server and not have a number instead

[@heptagonrus]

You did not explain what exactly TTL is. Is it TTL of a DNS record, of a DNS cache entry, of a DNS request, of a DNS propagation event, ... ?

[@RexDigitalis]

TTLs are on every network packet, but I imagine there may be a specific convention regarding the TTLs on any packets involved in a DNS request, which he could've gone into.

[@mrmuffin5046]

Can you explain DNS in email role. I can't under it

[@robl39]

If DNS uses UDP as the transport protocol, how does the DNS resolver correlate a given UDP request for a DNS query to any of the downstream servers to a given response? My understanding is UDP doesn’t have responses like TCP, so how do you get this “request/response” behavior?

[@phoenix-tt]

You're mistaking the transport protocol to the application protocol. It doesn't matter if you exchange information via TCP or UDP, it only matters that TCP guarantees message delivery by using SYN/ACK messages, variable window sizes, etc. For the application, like DNS queries, you would still get the response via UDP, but you don't waste network round-trips doing TCP. edit. From the program perspective, the easiest implementation (and the only one on Windows, if I recall correctly) is to block the thread and wait for the UDP response. The operating systems (be it Linux, Windows or even a router) are smart enough to send the message from a specific socket to the right application thread. So your naive blocking DNS resolver will be resumed and can process further.

[@shreyashjoshi4188]

Is it possible to modify the DNS records in local cache of system.

[@jmeadows469]

It's much easier to just add records to your hosts file, which your OS checks first before resolving a name over DNS. It's in /etc/hosts on Linux/Mac, and c:\windows\system32\drivers\etc\hosts on Windows. You'll need admin privs to edit it, though.

[@sprytnychomik]

I'll just stick to /etc/hosts - an OG DNS

[@anhtudinh4909]

can someone help me: does dns resolver run on my laptop or on a server?

[@huanorton1974]

why do not you intruduce the dnssec

[@bhavnanagar4589]

4:11

[@HamzaJaved-i1c]

Irfan ali

[@reviewlite]

1st view

[@smarteveryday1606]

i am just tuning my Tp link wifi router

[@md_ez]

list nmbrs in srvrs ttL time to liv , slow srvr

[@adicide9070]

hard to understand this diction, though. sorry to say! cause the content is ok.

[@xanadulim4969]

A valuable content, can you explain CIDR as the similiar method?

[@saprakr]

The best

[@samglima]

great video!

[@raj_kundalia]

amazing!