What is DNS (Domain Name System)?

[@mahendran189]

Being IBMer i feel this Video has clear information and complete Basic explanation

[@EhrlicherEdukator]

Do I know what DNS is? Yes. Do I watch her watch the video anyway? Yes! What a great explanation and pleasant voice!

[@IBMTechnology]

😄 Glad to hear that, thanks for watching!

[@yosefnegussie8790]

yea me too, I liked her complexion xox :)

[@dietmountaindew62]

how lonely are you ☠️🐀

[@mani-cd3zy]

Absolutely you are a Dumpass

[@mahendrarana1612]

Very clear, great explanation and clear voice. Thank you Pooja.

[@robertbartram8465]

Really nicely explained. Actually the best explanation I’ve seen so far. Thank you!

[@IBMTechnology]

Awesome, thank you!

[@shaylajones7892]

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!!

[@lowhweemiang8084]

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! ❤

[@rangiparkr]

Such a clear and easy to understand explanation!! So proud of you Pooja❤️❤️

[@zince6374]

Really proud of the women in CS! Excellent explanation 🥰

[@OmkarOP_07]

Khup Chan hota explanation, proud to see you at IBM, love from India❤

[@fm0x1]

Perfect explained and also very interesting. Thanks you again IBM for your content here on KZbin! Amazing!!!

[@chezmaincolette7900]

Smooth flow and easy to follow thanks Pooja from IBM

[@DaniIhzaFarrosi]

Thank you for the concise explanation. Really helps to visualize it. Now I can start reading some references to learn it more in detail

[@crimsonking1133]

Thank you 👍 This video helps a lot in understanding what a DNS is easier.

[@SidsVlog]

Nice, clear and concise explanation! Thank you.

[@foxman306]

Great explanation Really, like the way it was explained

[@jazzyfreshgames]

this video was so helpful and clearly explained, thank you!!!

[@giannosgavrielides7201]

Very nice explanation Pooja! Thank youu!

[@shaikabdussalaam5431]

Thanks Pooja . Hope we get more videos of this kind

[@SambulomatictheZimbabwean]

Very good loved your explanation understood the whole DNS lookup thank yu.

[@anandramalingam3027]

Very neat explanation Pooja 👏🏼👏🏼

[@karthikc326]

nice work explaining a technical concept.

[@534_tycs_ayush_sanghavi6]

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.

[@ibrahimkahveci8584]

Excellent instruction , thank you Pooja !

[@slash7640]

Great explanation, you made it easier and very detailed!

[@achugh52]

it was quite informative. well done

[@vengateshm2122]

Clean and clear. Thank you.

[@SuperMopga]

Thanks, Pooja! Nicely done!

[@animationtrends7036]

Thank you... This video was very informative.

[@wannanowramirez1116]

You're an amazing teacher. Thank you!

[@yuzohassan1367]

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?

[@benflint94]

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 :)

[@fireystella]

ideally the root/tlds are closer, the higher up the less there r

[@sriharisrivathsan284]

So informative. Thanks for the video! Help us learn more!

[@ralf2093]

Do you know how long does the ip address stay in the cache of the DNS resolver?

[@claucarballo]

You are so great! Best explanation!

[@ilmdost8088]

Thank you for such a nice difinition. ❤

[@xpandmediaries]

Awesome video! i understand what a dns is now!! Thank You

[@Harshu-pro5678]

Hi Pooja, thanks for sharing the video.Quite informative.

[@shilapadaganur6943]

thank you so much for this perfect explanation mam

[@naveenlakshman7928]

Just a correction 4.30 - 13 Root Name Servers run by 12 organizations with 1553 instances Worldwide

[@nvasudeva]

Exactly.. wherein she said we have 100s of root servers which is not true

[@slightlyambitious]

Awesome explanation, thank you!

[@mohitzen]

thankyou Thankyou a lot. but how's the writing done in opposite direction from your end?

[@aryankumar87771]

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 ?

[@benflint94]

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 😊

[@ZERO_TO_IT_HERO]

Absolutely awesome breakdown

[@oliviax.8166]

really great explanation!! thank you so much!

[@brianmanoti6030]

Great indeed very helpful......love it💌💌

[@cathlandemmanuel831]

Thank you so much, you did a justice to the topic.

[@thelitepredator]

Excellent thank you so much

[@nithinkumarhr6898]

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?

[@gsdvssb8911]

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

[@Sory_Bâh]

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?

[@devUi221]

thank you very much ❤

[@rachelhannah6959]

Good job pooja! Well explained

[@Valli_A_Youtuber]

Wow!! one of the best explanation of DNS I've ever seen

[@VikasChauhan-hs8py]

Thanks a lot! Pooja..

[@swhykto6075]

thank you...very well articulated.

[@mankanalanarasimhaiahsreer5024]

BRILLIANT EXPLANATION

[@nvasudeva]

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.

[@poojadevarajan919]

Hi. Thank you for the feedback. :) What was meant to be conveyed was that there are 100s of redundant root servers in different locations across the globe to handle the requests for the root zone. Yes, you are absolutely right about the 13 IP addresses that serve the DNS root zone.

[@viveks4816]

Thanks Pooja for the explanation and thanks IBM for these videos!

[@IBMTechnology]

You're welcome, Vivek, and thanks for watching! 🙂

[@bermick]

i think also the OS has a dns records cache, right? thanks for the video

[@moises8war]

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 😁

[@dietmountaindew62]

contact a therapist ☠️

[@shaju2796]

Great video, was prepping for an interview and it helped a lot :)

[@dreamsofaravind]

Doesn’t it check in the host file too before going to cache memory to resolve the url?

[@maheshr024]

Which technology or devices you used for this presentation. Specifically the drawing. I liked a lot.

[@IBMTechnology]

These videos are made using a lightboard.

[@alirezamosavi6185]

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 ?

[@AmiteshwarMann]

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?

[@josephmanu5664]

perfect tutorial!

[@MurangShaBu_MahalNaBiGas]

Love the presentation. Clear and precise

[@syedazharmohiuddin3007]

amazing, well explained 👍

[@clashclan4739]

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?

[@IBMTechnology]

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.

[@clashclan4739]

@@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 ❤

[@alexsnowblind]

Thank you Pooja, your explanation was very clear!👍😊

[@__-mf6fj]

How is she doing this, how did you guys recorded this, how can she write and draw everything mirrored. Great video so far btw.

[@IBMTechnology]

See ibm.biz/write-backwards

[@gsdvssb8911]

Good presentation, however, u didn't mention about the Host file which will be checked first before the cache

[@sibichakaravarthypugalenth9865]

I don’t understand why the DNS Resolver doesn’t checks the auth. Name server directly…?

[@simranjeetkaur-zh7uf]

Neat, clear and easy to understand..thank you

[@pritomdasradheshyam2154]

Very good explanation!

[@devinbayat]

Why can't the DNS server bypass all that and go straight to the Authority name server since it has all the information? I would appreciate the explanation if you could please provide it.

[@DhavalAhir10]

It will a lot hell time, If they store everything at only one place

[@mdafroze6123]

thankyou ibm and pooja

[@karankamat1480]

Great explanation!!

[@leonardooliveirapaschoal552]

I loved the way you explained! Very good!

[@spacebuddy5339]

Can she make more videos??

[@muhammadahmadrayan7148]

thank you excellent explanation

[@bossman.ishere]

Awesome Pooja.

[@Hyumanity]

Informational and clear. Thanks!!

[@boresight2]

Perfect thank you pooja 👍

[@rifleman542]

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 😀

[@swethavaradarajulu7790]

That was a great explanation poojiii .... Proud of u babe ❤️😙❣️😙.... Keep going 🔥🔥🔥🔥

[@salmaabo-zaid3604]

Thank you so much

[@MarkHeather]

Great video.

[@konjengbam7]

WHY DNS RESOLVER DIRECTLY GOES TO AUTH NAME SEVER

[@saimaheshwarsharma]

Nice explanation please provide link of the website you mentioned in the last part of video

[@IBMTechnology]

Hi there! All the links are provided in this video's description. 🙂

[@0061hrishi]

Do I have the wrong info? I knew there are only 13 root servers.

[@thedude3544]

Thanks :)

[@keviin077]

Thanks Pooja

[@pachko7164]

Video of a pedagogy largely under side compared to the number of views, thank you!

[@godwinbamigboye8326]

Very helpful

[@9ood-o7w]

nice explained

[@harshsonar9346]

How on earth is this video shot??

[@by-Org]

great job

[@janhusshuss8577]

Is this lady writting everything backwards?????

[@IBMTechnology]

Actually no. 😉 We shared some behind the scenes of our videos on the Community page, check it out here 👉ibm.co/3lIZaZV

[@ashleywalls4097]

i was like wtf!!!!!

[@enaiye]

Brilliant!

[@sowjanyay3424]

Increase volume

[@pancharles3136]

just wonder how she wrote that reversely???

[@pikachusquad21]

Because she has 3 brains🧠