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DNS Explained | Domain Name System | Cisco CCNA 200-301

CertBros
2021 ж. 22 Ақп.
182 971 Рет қаралды
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The Domain Name System (DNS) plays a very important role in modern-day networking. It's an unsung hero that allows us to use the internet in the simplest way possible. Without DNS, our connected lives would look very different.
DNS will take our domain name, and translate, or resolve it, into an IP address.
Let's say you want to go to your favourite website, so you type, www.certbros.com.
Remember, web servers do not work with domain names, so your computer needs to translate this into an IP address.
The first thing it does is check its local cache both on the computer and the browser. There’s also a local configuration file that's checked.
If there are no cache entries, your computer will send a query to something called a DNS recursive resolver asking for the IP address of certbros.com.
Once the DNS resolver receives your query, it checks its cache. If it can’t find an entry for certbros.com, it will send a request to another server, this is called a ROOT server.
The root server will then refer us to the top-level domain server (TLD) for .com. A TLD server is a server that contains information for domains with a specific extension. For example .com .org .net etc
The TLD server will then refer us to the authoritative nameserver.
The authoritative nameservers will have a record for Certbros.com and it will return the IP address to our DNS Resolver which will then send it back to our computer.
Out computer will now be able to contact the webserver using the newly discovered IP address.
#ccna #cisco #networking

Пікірлер

  • a visual learner appreciates you!

    @Nay-fm9sl@Nay-fm9sl3 жыл бұрын

    • I'm exactly the same! This is the reason this channel exists 👌

      @Certbros@Certbros3 жыл бұрын

    • ​@Certbros Being the small minded humans that we are 😂😂😂😂😂 Best line

      @anonymousfan9703@anonymousfan970311 ай бұрын

  • Your using of wireshark and clear images are highly useful. I learned the root, TLD and Authoritative that are hiden in the process of giving the ip of a url so that we can use it the reach the server. Also I saw that dns uses cache which is really effective. I also saw the type A of IPv4 and type AAAA of IPv6 in wireshark.

    @itaybarok9405@itaybarok94052 жыл бұрын

  • Just watched most of these videos this morning. I learned and retained more information here than I have in my Internet class at University. Thank you

    @53Karter@53Karter2 жыл бұрын

  • I've checked 3 sources trying to understand DNS but yours was the most clear and straight to the point explanation. Thanks!

    @AnasMations@AnasMations2 жыл бұрын

  • I swear I appreciate you guys so much I needed this break down !!! 🙌🏽

    @taydorion6467@taydorion64672 жыл бұрын

  • I've checked 10+ videos from popular sources on DNS resolution, everyone has a variation of their own while explaining DNS lookup, leaving me in confusion. They can spend hours in making those attractive animations, but can't afford to spend time in researching on how to actually demonstrate the DNS resolution process. You made the entire process very clear with a practical demo, so really thanks for that! Respect++ for your knowledge and research. My research on DNS resoluting ends here!

    @anup_narvekar@anup_narvekar7 ай бұрын

  • Just found CertBros. Glad I did! Im here to echo all the other positive comments. Well done! I especially appreciate the bite size chunks, Easily digested, and easy to go back and review. Dense 90 minute videos are too much to take in. Thanks!

    @guyot1979@guyot19792 жыл бұрын

    • Thank you Gregory! Really great to hear you like the videos! Easy to watch and understand is exactly im aiming for.

      @Certbros@Certbros2 жыл бұрын

  • New subscriber here! I love ur videos & there simple to understand. I just can’t watch a 60 minute video 😭 I need short & to the point and you’ve mastered that so Thk u!!

    @adriennewilson1680@adriennewilson16802 жыл бұрын

  • Love you bro ... Stay blessed and happy 🎊 Keep up the great work !!!!

    @divyanshuverma3205@divyanshuverma3205 Жыл бұрын

  • Awesome! Very well explained and I like the wireshark bit as well

    @bossvoip@bossvoip2 жыл бұрын

  • Thank you Certbros for being so awesome!

    @tubadurantdoda@tubadurantdoda Жыл бұрын

  • Incredible video. The best I've seen on explaining the basics of DNS.

    @charlesluhmann@charlesluhmannАй бұрын

  • The most facilated explanation! Thank you Man!

    @omarebadah2238@omarebadah22383 ай бұрын

  • 3:37 - Top level domain server or TLD ;-) Thanks so much for these, big bro! You're a legend! Coolest IT videos in internetz!

    @cammycool1627@cammycool16273 жыл бұрын

    • Damn! I didn't think it would be that noticeable. Haha! Thanks man, really appreciate it! 👌

      @Certbros@Certbros3 жыл бұрын

  • Mind blown but extremely interesting. Thank you 👌

    @davidbell7094@davidbell70942 жыл бұрын

  • Just brilliant. As always

    @Don-Carillo@Don-Carillo3 жыл бұрын

    • Gracias Don Neto!

      @Certbros@Certbros3 жыл бұрын

  • Awesome video!!

    @rogerthat7190@rogerthat71908 ай бұрын

  • Oh my goooddd. He is master in explanations😍 I subscribed

    @muhammadraza7231@muhammadraza72313 жыл бұрын

    • Haha! Thank you Muhammad! Great to hear you enjoyed the video 👍

      @Certbros@Certbros3 жыл бұрын

  • Another awesomely explained vid. A few more vids studying early at 3AM in the morning and I be done with your complete CCNA List. Will go thru it again entirely Sunday Night as a last speed review before my Exam on Monday Morning. I’m wondering though, how or where do you learn all those Windows PS networking commands? I’m only familiar with a short few commands like ipconfig, ipconfig /all, tracert barely a handful. But where do you find a good list of useful commands?

    @ardentdfender4116@ardentdfender4116 Жыл бұрын

  • Love your content!

    @mdnaseer6378@mdnaseer6378 Жыл бұрын

  • Wow this video was amazing. You guys are great very easy to follow

    @jamesgriffin7734@jamesgriffin77343 жыл бұрын

    • Thanks James, appreciate it!

      @Certbros@Certbros3 жыл бұрын

  • GOAT as always

    @maknetworks7229@maknetworks72292 жыл бұрын

  • Thank you for breaking down the dns

    @shafeen1058@shafeen10582 жыл бұрын

  • Amazing content, very instructive

    @jordanweir7187@jordanweir7187 Жыл бұрын

  • Awesome tutorials thanks. How do non TLDs differ from the basic TLDS? I see a lot more of those lately.

    @tresmcneil@tresmcneil2 жыл бұрын

  • what understandable methodologist r u ? u did clear my mind , i must subscribe to learn more esp networking, i am in love wz system and spend time everyday to know about. much thanks !

    @habtamusium8646@habtamusium86462 жыл бұрын

  • Thank you ❤

    @zeenaal-aldawoody2208@zeenaal-aldawoody22088 ай бұрын

  • Thanks for sharing this. I have just booked for my CCNA exam in 2 weeks.

    @dencam@dencam3 жыл бұрын

    • Good luck Dennis! You are going to smash it! 👍 Let us know how it goes.

      @Certbros@Certbros3 жыл бұрын

    • did you pass the exam?

      @alexmilliken1518@alexmilliken15183 жыл бұрын

    • @@alexmilliken1518 Yes I passed with a score of 930/825

      @dencam@dencam3 жыл бұрын

    • @@dencam heyo good job

      @alexmilliken1518@alexmilliken15183 жыл бұрын

  • Well articulated Sir. Thanks

    @ndedivine5068@ndedivine50682 жыл бұрын

  • Great Tutor and interesting video contents... Thank you to keep posting

    @elmehdibenseddik2689@elmehdibenseddik26893 жыл бұрын

    • Thank you! Glad you liked the video.

      @Certbros@Certbros3 жыл бұрын

  • Thank you again for your info!

    @Spaniards56@Spaniards562 жыл бұрын

    • My pleasure Flavio!

      @Certbros@Certbros2 жыл бұрын

  • Sir! you just nailed it. Awesome detailed explanation specifically steps after Root DNS resolver. I subscribed. There is one this I wanted to point out regarding TLD and you kept saying TDL. Just as a curiosity can we say it as TDL?

    @abhishekaouchat8419@abhishekaouchat84192 жыл бұрын

    • Thank you Abhishek! Welcome to the channel 👌🎉 Great spot! This was a mistake. It should always be TLD.

      @Certbros@Certbros2 жыл бұрын

    • @@Certbros You are really amazing mate! You have my respect!

      @noodler911@noodler9112 жыл бұрын

  • Do you have a video on how to create a DNS resolver server? You seem to have very good content, I'm considering subscribing.

    @jhde9067@jhde90672 жыл бұрын

  • Thank you for this videos

    @user-hx1es3li8p@user-hx1es3li8p2 жыл бұрын

  • Excellent Teaching !

    @upalidharmasiri155@upalidharmasiri1553 жыл бұрын

    • Thank you!

      @Certbros@Certbros3 жыл бұрын

  • Thank you very much

    @cyriljohns@cyriljohns9 ай бұрын

  • -DNS resolver usually run by your ISP but can be run internally

    @seetsamolapo5600@seetsamolapo5600 Жыл бұрын

  • THANK YOU.

    @storaman12@storaman12 Жыл бұрын

  • This is awesome

    @gerardklien6889@gerardklien6889 Жыл бұрын

  • "It's DNS" "It's not DNS" "It was DNS" "It's always DNS"

    @Amphibiot@Amphibiot3 жыл бұрын

  • Very informative👍

    @thefreedom111@thefreedom1112 жыл бұрын

    • Thank you Daniel!

      @Certbros@Certbros2 жыл бұрын

  • Thank you!

    @JoseGarcia-uz8uc@JoseGarcia-uz8uc3 жыл бұрын

    • You're welcome Jose!

      @Certbros@Certbros3 жыл бұрын

  • than you very much!

    @aruizsilva@aruizsilva22 күн бұрын

  • Thanks alot 👍

    @LightBueno@LightBueno Жыл бұрын

  • One thing I would have liked to see is an explanation of how DNS handles DHCP assigning a new IP address to an old URL.

    @wmblasius3794@wmblasius37942 жыл бұрын

    • Great suggestion. Thanks for the feedback 👌

      @Certbros@Certbros2 жыл бұрын

  • Thank you

    @lsontech237@lsontech237 Жыл бұрын

  • 2:45, love the LOL @ Yahoo.com. :D

    @anthonyisensee@anthonyisensee2 жыл бұрын

  • Just keep uploading these videos.

    @vauxhallchevette5858@vauxhallchevette58583 жыл бұрын

    • Thank you!

      @Certbros@Certbros3 жыл бұрын

  • Very good videos thanks a lot , may I ask you what software you use for making animation?

    @SolucionesELP@SolucionesELP3 жыл бұрын

    • Thank you! I use After Effects and Premiere Pro. Links are in the description if you want to check them out. 👍

      @Certbros@Certbros3 жыл бұрын

    • @@Certbros thanks a lot

      @SolucionesELP@SolucionesELP3 жыл бұрын

  • Excellent video, thank you. How does DNS determine the closest server for distributed systems?

    @JamesSmith-cm7sg@JamesSmith-cm7sg3 жыл бұрын

    • Thanks James! Really appreciate it 👍 Anycast DNS is an option for location-based DNS.

      @Certbros@Certbros3 жыл бұрын

  • Great!!!

    @WeBBerTutoriais@WeBBerTutoriais3 жыл бұрын

    • Thank you 👍

      @Certbros@Certbros3 жыл бұрын

  • First😎

    @alifarooq77@alifarooq773 жыл бұрын

    • Legend! 👌

      @Certbros@Certbros3 жыл бұрын

  • Why do we need the root for and not just go stright to TLD?

    @mcpulya6890710@mcpulya68907102 жыл бұрын

  • @certbros -- at the 4:42 mark your narrator referred to a TDL. As I have taken notes and studied your content so far, I am unable to resolve TDL to a term I have learned. I am currently stuck at this point in the video because I must learn TDL before moving on, in case it is important. Thank you.

    @NachoManBoy4@NachoManBoy43 жыл бұрын

    • Sorry Ryan, this was a mistake. I was supposed to say TLD not TDL.

      @Certbros@Certbros3 жыл бұрын

    • @@Certbros Understood now, thank you sir.

      @NachoManBoy4@NachoManBoy43 жыл бұрын

    • @@Certbros Thank you! Watching this video now and I was getting confused. Thanks for the clarification.

      @annm.8231@annm.82312 жыл бұрын

  • Can you please do a video on BGP ? 👍 Thanks !!!

    @arjunmadhav94@arjunmadhav943 жыл бұрын

    • Definitely 💯

      @Certbros@Certbros3 жыл бұрын

  • Is to much for a root servers to resolve all existing Domain names instead of this long journey to get this 4 bytes information ?

    @justcurious1940@justcurious194011 ай бұрын

  • So why did we use UDP to send the info and not TCP

    @andywarrier489@andywarrier489 Жыл бұрын

  • Where is the full course ? i opened the link and it said it is under work ?

    @rohansharma4844@rohansharma4844 Жыл бұрын

  • I don't get it! why not go directly to the name server in the first place?

    @yofi2614@yofi26142 жыл бұрын

  • thank god ! a great explanation without a terrible Indian accent

    @sasansaljoughi1893@sasansaljoughi18932 жыл бұрын

  • TDL? or TLD?

    @nigelang5985@nigelang5985 Жыл бұрын

  • ❤😊

    @MOMO-YYDS@MOMO-YYDS5 ай бұрын

  • 3:37 T L D, not tdl, must be a typo/speech-o?

    @lakatosalex@lakatosalex3 жыл бұрын

    • Great spot. I kept saying TDL. I also say it at 4:41 🤦‍♂️

      @Certbros@Certbros3 жыл бұрын

  • do you even cert bro?

    @a-face9333@a-face93332 жыл бұрын

  • One thing I have never quite understood is why there must be 4 different DNS servers. Do each hold different levels/amounts/classes of addresses in their DNS caches?

    @sartoriusrock@sartoriusrock2 жыл бұрын

    • And, if the Resolver, Root, or TLD does have it in the cache, does it shortcut the need to contact the servers "higher up the chain"?

      @sartoriusrock@sartoriusrock2 жыл бұрын

    • Yea it’s super effing confusing

      @reprisal1051@reprisal1051 Жыл бұрын

  • nice

    @rafay1708@rafay17083 жыл бұрын

    • Thanks

      @Certbros@Certbros3 жыл бұрын

  • cool bros

    @bakyhummedow373@bakyhummedow3733 жыл бұрын

    • Thanks!

      @Certbros@Certbros3 жыл бұрын

  • Why does the narrator keep referring verbally to the TLD server as the TDL server??

    @whpromo@whpromo2 жыл бұрын

  • you said TDL again at 4:45 lol

    @mobamba914@mobamba914 Жыл бұрын

  • i swear you also make skyrim videos

    @RosiePaintsMinis@RosiePaintsMinis Жыл бұрын

  • 3:35 TLD, not TDL. :)

    @georgetsiklauri@georgetsiklauri Жыл бұрын

  • Any update on the full course?

    @themistoclesnelson2163@themistoclesnelson21632 жыл бұрын

    • Still working on the content. I'm just about to release some new videos in the next few days. Then I'll be starting on the practical labs. Have you already signed up?

      @Certbros@Certbros2 жыл бұрын

    • @@Certbros Oh cool! Yes I have! Scheduled my exam for December.

      @themistoclesnelson2163@themistoclesnelson21632 жыл бұрын

    • @@themistoclesnelson2163 Great to hear it! Keep up the studying and you'll smash the exam 😁 Feel free to email me anytime.

      @Certbros@Certbros2 жыл бұрын

    • @@Certbros Thanks! Thats why your the man!

      @themistoclesnelson2163@themistoclesnelson21632 жыл бұрын

  • What is the IP of Root DNS server? DNS Explained doesn't seem well explained.

    @Channel-qr5mh@Channel-qr5mh11 ай бұрын

  • Yahoo(lol) 🤣🤣🤣🤣

    @JK-cp9pt@JK-cp9pt2 жыл бұрын

    • 😂

      @Certbros@Certbros2 жыл бұрын

  • Yahoo (LOL)

    @Spankytimez@Spankytimez2 жыл бұрын

  • tld, not tdl

    @youmich@youmich2 жыл бұрын

    • Good spot!

      @Certbros@Certbros2 жыл бұрын

  • ביאששששששששששששששששששששש

    @user-sx7wt6ny3d@user-sx7wt6ny3d Жыл бұрын

  • Can I donate

    @the77th@the77th3 жыл бұрын

    • The only donation I need is a like and a subscribe! 😁 But if that really isn't enough, you can check out my CCNA course here: certbros.teachable.com/p/cisco-ccna/?product_id=2833094&coupon_code=PRELAUNCH21 Glad you liked the videos.

      @Certbros@Certbros3 жыл бұрын

    • @@Certbros just purchased ❤️❤️❤️❤️! Will this course help me study and pass the ccna 200-301 ?

      @the77th@the77th3 жыл бұрын

    • Thata great to hear. Thank you 🙏 Yes this course will absolutely help you pass the CCNA. Good luck with your studies and enjoy the course 👌

      @Certbros@Certbros3 жыл бұрын

  • ti-di-el?

    @strcelrau@strcelrau3 жыл бұрын

    • TLD*

      @Certbros@Certbros3 жыл бұрын

  • Nice content- please change your intro.

    @thesootsplays1975@thesootsplays19752 жыл бұрын

    • Thank you. Out of curiosity, what about the intro don't you like?

      @Certbros@Certbros2 жыл бұрын

  • You have it as TLD but are saying TDL.. just a heads up friend! Thanks for the explanation in the video! 😁

    @user-rb8bl3gs9k@user-rb8bl3gs9k Жыл бұрын

  • @3:50 TLD not TDL

    @BeachSamuraiStudios@BeachSamuraiStudios10 ай бұрын

  • Thank you

    @modapothularajasekhar4645@modapothularajasekhar464510 ай бұрын

  • Thank you

    @gansgross6464@gansgross64643 жыл бұрын

    • You're welcome

      @Certbros@Certbros2 жыл бұрын
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