What is DNS (Domain Name System)?
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- čas přidán 2. 06. 2024
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Domain Name System (DNS) is what makes it possible for users to connect to websites using Internet domain names and searchable URLs rather than numerical Internet protocol addresses, but how does this all work?
In this lightboard video, Pooja Devarajan with IBM Cloud, visually breaks down what DNS is, how it works, and walks use through the DNS lookup process to show how a DNS record is returned from a DNS Server.
Chapters
0:00 - Intro
0:14 - Differences between DNS and IP Address
1:27 - DNS Resolver
2:28 - How DNS Lookup process works
6:52 - Summary
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Do I know what DNS is? Yes. Do I watch her watch the video anyway? Yes! What a great explanation and pleasant voice!
😄 Glad to hear that, thanks for watching!
yea me too, I liked her complexion xox :)
how lonely are you ☠️🐀
Being IBMer i feel this Video has clear information and complete Basic explanation
Great explanation with ingenious visuals of showing the writing of the code and the instructor's facing the audience! Brilliant. I learn so much about DNS resolution from this video! ❤
I'm currently in school and this break down and visual was awesome!! I"m a visual learner so this helped me tremendously!!! THANK YOU! Will definitely be coming back to learn more!!
Really nicely explained. Actually the best explanation I’ve seen so far. Thank you!
Awesome, thank you!
Very clear, great explanation and clear voice. Thank you Pooja.
Thank you for the concise explanation. Really helps to visualize it. Now I can start reading some references to learn it more in detail
Such a clear and easy to understand explanation!! So proud of you Pooja❤️❤️
Wow!! one of the best explanation of DNS I've ever seen
Very nice explanation Pooja! Thank youu!
Great explanation, you made it easier and very detailed!
Perfect explained and also very interesting. Thanks you again IBM for your content here on CZcams! Amazing!!!
Absolutely awesome breakdown
Great video, was prepping for an interview and it helped a lot :)
Excellent instruction , thank you Pooja !
this video was so helpful and clearly explained, thank you!!!
Nice, clear and concise explanation! Thank you.
Love the presentation. Clear and precise
Very neat explanation Pooja 👏🏼👏🏼
Thanks, Pooja! Nicely done!
Thank you Pooja, your explanation was very clear!👍😊
Clean and clear. Thank you.
Good job pooja! Well explained
Khup Chan hota explanation, proud to see you at IBM, love from India❤
Smooth flow and easy to follow thanks Pooja from IBM
Thank you 👍 This video helps a lot in understanding what a DNS is easier.
Very good loved your explanation understood the whole DNS lookup thank yu.
Hi Pooja, thanks for sharing the video.Quite informative.
You're an amazing teacher. Thank you!
nice work explaining a technical concept.
Thanks Pooja . Hope we get more videos of this kind
Neat, clear and easy to understand..thank you
Awesome explanation, thank you!
really great explanation!! thank you so much!
Awesome video! i understand what a dns is now!! Thank You
Really proud of the women in CS! Excellent explanation 🥰
Informational and clear. Thanks!!
Very good explanation!
Thanks Pooja for the explanation and thanks IBM for these videos!
You're welcome, Vivek, and thanks for watching! 🙂
amazing, well explained 👍
Great explanation!!
Thank you so much, you did a justice to the topic.
Awesome Pooja.
thank you...very well articulated.
Great Explanation you have done whole Dns concept is clrare in one video and we can interpret in our own words thanks for thid amazing video. But i want to see her in mkre content which seems very less so please let her give more chance.
Great indeed very helpful......love it💌💌
thankyou ibm and pooja
BRILLIANT EXPLANATION
thank you so much for this perfect explanation mam
Perfect thank you pooja 👍
Thanks a lot! Pooja..
Excellent thank you so much
perfect tutorial!
thank you excellent explanation
I loved the way you explained! Very good!
Great video.
nice explained
Video of a pedagogy largely under side compared to the number of views, thank you!
Very helpful
great job
thank you very much ❤
Do you know how long does the ip address stay in the cache of the DNS resolver?
Thanks Pooja
very well explained miss, is the ip address of the websites cached on our browser ( client side as well ) or only on the dns resolver ?
Hey Aryan, it's cached on your operating system and browser, as well as the resolver - the time it stays cached on your device and browser depends on the TTL -Time To Live property set by the person who owns/ manages the domain 😊
thankyou Thankyou a lot. but how's the writing done in opposite direction from your end?
Good presentation, however, u didn't mention about the Host file which will be checked first before the cache
when one gets a "host not found" error, what part of this diagram causes that error? Is it when the host that one is looking for does not exist in the Auth Name Server so no IP address is sent by Auth Name Server?
Very informative video, easily understood, just one question tho... if the Authority Domain Server has all the records of IP Adresses, why the need to use Root Servers and TLDs? Why not just skip ahead and directly ask Auth Name Server for the IP?
Hey Yuzo, because the DNS resolver doesn't have the IP address for the authoritative name server. To find the IP address of the auth name server it has to ask the root and then the TLD :)
ideally the root/tlds are closer, the higher up the less there r
i think also the OS has a dns records cache, right? thanks for the video
Great job but i am not sure if it's correct to say that we have 100s of root server. We have 13 root servers starting from A to M. While these servers may have replicas going on but as far as i know there are only 13 root servers.
That was a great explanation poojiii .... Proud of u babe ❤️😙❣️😙.... Keep going 🔥🔥🔥🔥
Please I have a question,
So why the domain resolver doesn't just send the data directly to the authority name server instead of sending it to root server, tld server and name server?
So what the purpose of these process?
Which technology or devices you used for this presentation. Specifically the drawing. I liked a lot.
These videos are made using a lightboard.
Hi
I have a qs
You said that after accessing the tld we will request the domain server to get it's up using it's DNS records
But I think it's redundant because we have the domain first and we can use it to send the request to it to get the main IP address
But I don't know why we are working like this ?
Thank you so much
Thanks :)
Nice explanation please provide link of the website you mentioned in the last part of video
Hi there! All the links are provided in this video's description. 🙂
Why can't dns resolver send request directly authoritative server instead of root server, tld ? Or directly ro tld instead of root server? How many authoritative servers available? If it's relatively less, dns revolvers can store ip addres of tld or authoritative server to directly get the ip address?
It's because DNS is a hierarchical structure where u have to go through the top level and then come down just like u can't contact a President directly u will have to go through hierarchy. It's in order to prevent all the load going on the Authoritative server directly and for managing purposes it is easier otherwise one admin has to look after all the things. DNS is there to delegate that authority
Just a correction 4.30 - 13 Root Name Servers run by 12 organizations with 1553 instances Worldwide
Exactly.. wherein she said we have 100s of root servers which is not true
Perfect
How it directly send request once it get ip address? Lets say the user is in south India and access website running at north US. How will it communicate?
Hi there! The browser sends a HTTP request to the web server. This request is sent across using TCP/IP. The location of the web server and the user shouldn't matter for accessing the website until and unless it is a region restricted website in which case you might require VPN. If the server is located in a geographically distant location then there might latency issues but accessibility should be fine. Although this problem is tackled by using a distributed system where website owners can setup servers at various locations.
@@IBMTechnology thanks for your reply. But my question is, how the request is routed to the exact server. Lets say my request will go to my ISP and then from my ISP where the request go.. until it reaches the destination server. Im also aware of packets that will contain meta data. But how exactly its work? Can you pls make a video to understand better ❤
How is she doing this, how did you guys recorded this, how can she write and draw everything mirrored. Great video so far btw.
See ibm.biz/write-backwards
awesome
Can she make more videos??
Do I have the wrong info? I knew there are only 13 root servers.
WHY DNS RESOLVER DIRECTLY GOES TO AUTH NAME SEVER
Out of all the public IP addresses available she had to choose an RFC 1918 or private IP address that in not routable over the Internet 😀
As a human, I actually use numbers to refer to the people in my network. My father is parent 1, and my mother is parent 2. I also number all my friends. I guess I'm the odd one 😁
contact a therapist ☠️
Yes indian 🇮🇳
Increase volume
just wonder how she wrote that reversely???
Because she has 3 brains🧠
👍🏽
Is this lady writting everything backwards?????
Actually no. 😉 We shared some behind the scenes of our videos on the Community page, check it out here 👉ibm.co/3lIZaZV
i was like wtf!!!!!
I trust you because you are Indian.
Am I the only one who noticed that she's writing backwards?
See ibm.biz/write-backwards
@@IBMTechnology I never thought of just flipping it, what a simple solution! Thanks for that!
ummm is she writing backwards???
See ibm.biz/write-backwards
Look in cache memory first - realy.I'm disapointed. This channel for future professionals but not for funs. Į expected more details explanations.
Very correct
she should say local host file instead of memory.
So informative. Thanks for the video! Help us learn more!