DNS Records

[@itfreetraining]

Thanks, glad to hear that you like the videos.

[@itfreetraining]

No problem at all. Thanks for watching.

[@WijthaGayan]

huh ?

[@farukhshaikh2672]

Its just due to your videos i am able to understand windows servers. May God bless you guys.

[@itfreetraining]

Farukh Shaikh Thanks very much, glad we could help you

[@mcsephiroth1312]

Thank you for this explanation. I understood it much better than Google IT Training's explanation.

[@itfreetraining]

You are welcome!

[@itfreetraining]

Thanks Adam! Good Luck taking them

[@greatsky8226]

Competent video with brilliant rhetoric.

[@itfreetraining]

Thanks very much.

[@JDBoelter]

Good presentation - clearly miked and clearly delivered, good plain English explanations. I feel as if I understand SOA and NS records much better now. Thanks!

[@itfreetraining]

You're most welcome! Thank you for your kind feedback. :)

[@ramziboutaoua3298]

You got the art of explaining, you are the best

[@TebogoMotlhale]

Yeah, he is best by FAR. The others tend to fall into the trap of starting off by using too many SIMPLE analogies and then when the topic goes deeper, it gets harder for them to find perfectly equivalent concepts in the analogy, to keep using that analogy in a manner that is STILL relevant/meaningful to the topic 😁

[@ramziboutaoua3298]

@@TebogoMotlhale exactly, some times calling things by their real names works much better then exaustive analogies

[@jdphd123]

I am so glad that you made available this information and video.* Also the narration and manner used.

[@itfreetraining]

Thanks very much. Glad to hear that you like the video.

[@syedjunaid7846]

4:10 did you mean when a DNS server has an email it needs to end it needs to locate a mail server

[@itfreetraining]

It is a little confusing. So essentially lets say that an e-mail server wants to send an e-mail to example.com. In order to do this, it needs to send the e-mail to the example.com mail server. So it performs a look up to find out where example.com mail server is. Essentially gets the MX record for example.com. The mail server then contacts the example.com mail server and transfers the mail to it.

[@Mangokyaw]

I am so confused.. what are the differences between the MX, pop3, Imap4, snmp, smtp?

[@itfreetraining]

DNS MX (Mail Exchanger) Record: MX records are DNS records that specify the mail servers responsible for receiving email messages on behalf of a domain. MX records help route email messages to the correct destination by pointing to the mail servers' hostnames or IP addresses. MX records are essential for email delivery, as they determine where incoming email messages should be delivered within a domain. POP3 (Post Office Protocol version 3): POP3 is an email retrieval protocol used by email clients to retrieve email messages from a mail server. POP3 typically downloads email messages to the client's device, removing them from the server. This means that emails are stored locally, and changes made on the client do not affect the server's copy. POP3 is commonly used for downloading emails to a single device, like a computer. IMAP4 (Internet Message Access Protocol version 4): IMAP4 is another email retrieval protocol used by email clients to access email messages stored on a mail server. Unlike POP3, IMAP4 allows multiple devices to access the same mailbox simultaneously and keeps emails synchronized across all devices. Changes made on one device are reflected on the server and other devices. IMAP4 is suitable for users who want to access their emails from multiple devices and keep them synchronized. SNMP (Simple Network Management Protocol): SNMP is a network management protocol used for monitoring and managing network devices like routers, switches, and servers. SNMP allows network administrators to collect data and manage devices remotely by querying and configuring settings on network equipment. It is not directly related to email or DNS but is essential for network management and monitoring. SMTP (Simple Mail Transfer Protocol): SMTP is an email sending protocol used to send outgoing email messages from a client to a mail server or from one mail server to another. SMTP is responsible for routing and delivering email messages to their intended recipients. It works together with MX records and other email protocols. SMTP is essential for the delivery of email messages across the internet. In summary, DNS MX records help route email messages, while POP3 and IMAP4 are email retrieval protocols for accessing email messages stored on mail servers. SNMP is a network management protocol, and SMTP is an email sending protocol responsible for delivering email messages. These protocols serve different roles in the email and network communication process.

[@吕汉楠]

very good ,this lesson explain the knowledge very well. thanks

[@itfreetraining]

Thanks very much. Glad we could help.

[@MsAshutosh123]

Can you make a video on different types of http error codes in the same whey.your videos are simple and easy to understand

[@adamwilkinson007]

Thanks guys this is brilliant your going to help me get me through my exams for 70-410 :-)

[@waseemhasan5372]

Much appreciated the graphics and explanation. Keep up the amazing work!

[@itfreetraining]

Much appreciated!

[@mez1486]

I do everything right but the SPF record can't be verified so frustrating!

[@onlyeyeno]

This is a good and very well presented video and I'm very grateful for You making and sharing it. That said I think it could have been even better if it had used more "graphical slides", if the type You used when explaining (clarifying) the "MX record". Showing an "over view" of where (in the network) the different records would be "held".And how they would "querried and answer" to fulfill their function is something I believe would facilitate learning and grasping the context of, and relation between the different records. Again many thanks for making and sharing this excellent content Best regards.

[@raghuveershetty2922]

nice clear explanation with examples and with easy english

[@itfreetraining]

Thanks!

[@doubledogdare610]

Thanks Sir! I have been looking for somthing that can help me with my mail server but finally! I didnt know that i was using the wrong record...

[@arvindpal8070]

Thanks to explain DNS record in easy to understand

[@itfreetraining]

It's my pleasure

[@Thepankaz1]

For CNAME Record where does it maintain ip for web1, cname stors alias but how is actual ip is obtained for web1, is another call made to another dns server which maintains a A record or same server maintains both CNAME and A record.

[@itfreetraining]

The resolver sees that it's a CNAME and begins its search over again at the root domain level. For example, if there is a DNS zone as follows: NAME TYPE VALUE -------------------------------------------------- bar.example.com. CNAME foo.example.com. foo.example.com. A 192.0.2.23 when an A record lookup for bar.example.com is carried out, the resolver will see a CNAME record and restart the checking at foo.example.com and will then return 192.0.2.23.

[@precisionit1422]

Very good videos with full clarity.Well done sir but no videos on AD DS backup and restore.pls upload sir.

[@itfreetraining]

Sorry about that, will get those videos done when we can.

[@cskillet2003]

Great video on common resource records!

[@itfreetraining]

Thanks!

[@abhijeetnegi6484]

i still watch ur awesome expalnations, and it is jus so good.

[@jgwood89]

When you said "another A record", did you mean another Alias Record?

[@itfreetraining]

That's correct.

[@jgwood89]

Thank you. Also, since PTR works the opposite of A records essentially, does that mean it also works the opposite of CNAME records?

[@itfreetraining]

The A record maps a name to one or more IP addresses, when the IP are known and stable. The CNAME record maps a name to another name. It should only be used when there are no other records on that name. The A name must resolve to an IP, the CNAME and ALIAS record must point to a name. To answer your question: No, PTRs are not the opposite of CNAMEs. CNAMEs are similar to aliases and point to another hostname vs an A record which points to an IP.

[@Ragatokk]

How do I set up my server when I have it on a subnet? Say my external ip is 84.22.1.331 but my local ip is 192.168.1.2. How would I set up my www.website.com to be sendt to the server with the local ip of 192.168.1.2 ?

[@itfreetraining]

+Ragatokk Your server is using a private IP Address. So you need to configure your home router to forward web traffic to that server. So in your router, forward port 80 to 192.168.1.2

[@Ragatokk]

Thanks, but how do I do it when I have two servers on the same network?

[@itfreetraining]

+Ragatokk Multiple web sites can share the same IP Address. The web server should use the incoming DNS to work out what web site it is. However, you will not be able to have to servers using the same port unless you have two different public IP Addresses.

[@richardcummins3649]

You have a collection of great videos. Very informative!

[@itfreetraining]

Thanks for the great feedback! We appreciate you choosing ITFreeTraining!

[@ramireddy5071]

excuse me sir i have a doubt what do you mean by resource records?(my exam question) ca i write your explanation for that question thank u sir

[@srirama4580]

i have a live scenario.. Windows 2012 installed with AD and Dns. Standard configuration. noticed if i nslookup ip and hostname . all good if i use the fqdn there is 2 request time out and a reply. if i use fqdn with dot at the end its good. please help Thanks in advanc

[@itfreetraining]

Sri Rama I am not sure what the problem is here. Windows will normally add the dot at the end so you don't need to worry about it. It is strange that it requires it to be there. Have you configured your own root servers or are you forwarding the requests to your ISP?

[@hunkmujeeb]

I am unable to ping Server 2K8r2 to win 7 host. I have created DNS forward and reverse records and allow ICMP also.

[@itfreetraining]

What happens when you try to ping the IP address directly?

[@keplerdevelopers9636]

Why there is not MX record when I nslookup www.hotmail.com ?

[@itfreetraining]

Hotmail seems to want to use a CNAME record vs a traditional MX record. That's probably why.

[@chrisharrid5725]

Really helped me. Thanks for that.

[@itfreetraining]

You're welcome!

[@albixhako1727]

Thank you. Very simple and informative way.

[@itfreetraining]

Glad it was helpful!

[@sergei4517]

Excellent right to the point explanations. Thanks a lot!

[@itfreetraining]

Glad it was helpful!

[@bobylikescars]

there's a difference between A Records and CName, CName can't be used for naked domain names.

[@itfreetraining]

CName are like a shortcut like that used in the file system. For example, if you had www.itfreetraining.com and itfreetraining.com you could create a CName to like one to the other. This way you only have one A record making it easier to manage.

[@sordodikra5129]

You are truly amazing. THANK YOU.

[@itfreetraining]

You're welcome! Thanks for the amazing feedback. :)

[@kittnlogic]

Thank you for the clear and concise lesson! So helpful!

[@playpalvr]

So helpful!

[@itfreetraining]

Glad it was helpful!

[@hisatnam]

Wow, I liked it. Thanks for sharing this with us.

[@itfreetraining]

Thanks for watching.

[@lakminarathnayake2165]

Great Knowledge Video of DNS records I ever see

[@itfreetraining]

Thank you.

[@MrPrasad730]

Very clear explanations. Keep up the good work ! thx

[@itfreetraining]

Thanks very much. More videos to come.

[@TheAmazeer]

Great job.. a value added would have been to show Dns configuration but maybe you did it on another video

[@andreigheorghe5402]

I love your presentations.

[@CLAIREdujardin]

Very clear explanations. Keep up the good work !

[@itfreetraining]

Thanks for watching.

[@sencadas32]

Congratulations! Nice video!

[@itfreetraining]

+Vinicius Thank you very much, we're glad to hear your feedback.

[@leo-rq2ei]

Nicely done 👏👏

[@itfreetraining]

Thanks!

[@chandranaggmchandranag8818]

Finally found this Thank you sir

[@itfreetraining]

Thanks for watching.

[@bryanmendoza3919]

great it will help me on how to recognize those records in DNS

[@itfreetraining]

Glad we could help.

[@GunelMammadova93]

thanks for the video! Learned a lot from it

[@itfreetraining]

Glad it was helpful!

[@enizi1]

Thank you very much ,,it is very helpful.

[@itfreetraining]

Thanks, glad we could help.

[@bulelanicutalele7940]

Helpful indeed, clear explanation

[@itfreetraining]

Thanks for the great feedback and for watching!

[@eavincentg]

Thank you. Excellent tutorial!

[@itfreetraining]

Thank you for your great feedback!

[@balajidhatchanamoorthy3198]

superb,its really useful to me to understand thanks a lot

[@itfreetraining]

+Balaji Raina You're most welcome.

[@mohamedabas942]

i dont know the use of this stupid service record .. its allways spam filessrv like this ::::::: Firefox Setup 16.0.1SrvSrvSrv .. and i dont know how to stop it .. it creat about 50 - 74 file when i start any program or click any icon :S any one can help me in this ?

[@itfreetraining]

Mohamed Abas I have not heard of this before. If you know which computer it is coming from I would do a check for the computer to see what software is installed. perhaps run a packet sniffer on the computer to work out which software is creating them. Perhaps it is Malware so I would do a check for that as well.

[@itfreetraining]

Thanks very much.

[@hemang81]

Thanks...It's been very very informative..!!

[@itfreetraining]

You're very welcome!

[@nifink.antony6953]

Amazing..Nice

[@netaishvasistha9875]

Great Video very well Expained Thx

[@itfreetraining]

Thanks very much and thanks for watching.

[@eleftheriosiliopoulos8796]

it is valid 100% for the 70-411.

[@itfreetraining]

+LEF ISOS Excellent, we're always excited to confirm our content lines up with the Microsoft exams.

[@patrickjohnyap2112]

very well said :) thanks for all the videos

[@mattia7737]

thank you very much it really help me

[@itfreetraining]

Thanks for watching.

[@shubhamjoshi_SELabs]

Excellent! Thank you

[@itfreetraining]

+shubham joshi We're glad you think so! You're welcome and thank YOU for watching!

[@itfreetraining]

Thanks.

[@DillonMinasian]

Great Video, helped explain a lot. Thanks :)

[@felixmintah8632]

Great video

[@itfreetraining]

Thanks very much.

[@alihaleem2705]

thanks again .. great video

[@itfreetraining]

You're welcome!

[@roxriver91]

thank you, excellent.

[@itfreetraining]

+roxriver91 You're welcome! Thanks for watching.

[@bder88]

thx alot , great video

[@kevinportillo1971]

Out of everyhting from TCP/IP if find this topic the most difficult to remember !!!!

[@itfreetraining]

Networking isn't always intuitive so stick with it!

[@boatengokyere-darko3806]

I love it soo much, Cheers.

[@YouSsefDjOGeekOfficial]

well explained thanks !

[@itfreetraining]

You're very welcome!

[@lucha_ftw]

Great stuff

[@itfreetraining]

Thank you!

[@thaernidal9832]

it's helpful thank you

[@itfreetraining]

You're welcome, glad the video was helpful!

[@nithinkg2880]

great video

[@itfreetraining]

+Nithin Kg Thanks!

[@kedmnc895mna]

This is great.

[@itfreetraining]

Excellent, thanks for the wonderful feedback.

[@raghuveershetty2922]

if they start training institute in indian many students will benefit

[@dean6845]

I'm studying computer networking for few weeks using web pages and youtube and I mostly encountered courses with indians (I hope that's how you call people from india) so I'm not sure if they even need teacher, since they are teacher itself :D Kidding, but sometimes they really are "know-it-all". Great video and explanations :) Peace

[@Metallnsanity87]

1.25 video speed is best

[@shihabuddinnori8236]

thanks thanks thanks thanks

[@Rassamaxa1000]

very good!!thanks

[@michaelsiengo1]

Am I the only one who thinks DNS is confusing as hell been trying to learn it for about a month

[@itfreetraining]

DNS can be difficult at first, is there anything in particular you are having problems understanding?

[@messiassantos5140]

Thank you I mean it u helped me

[@itfreetraining]

You're most welcome, thanks for watching!

[@gonzalotrepiana6628]

thanks so much!!

[@iftekmahmud]

Sorry but this is a terrible and hard to understand presentation for beginners. A more visual explanation of what's being said would've been helpful.

[@itfreetraining]

Sorry to hear that. We are currently redoing the way we do videos so future videos should be better.

[@منوعاترنيم-ص7و]

thanks

[@itfreetraining]

You're most welcome!

[@CorporateMajdoorTrader]

Such a vague explanation

[@itfreetraining]

This is a pretty old video now. It helps if you watch the other DNS videos as well. We generally make the videos now so they can be watched by themselves. Is there anything in particularly you are having trouble understanding.

[@ziaullah9541]

awesome

[@itfreetraining]

Thanks!

[@vjnvisakh]

nice.

[@mahdiehshahhosseinian3558]

so confusing

[@itfreetraining]

What do you find confusing?

[@rothscliff6086]

teaches better than Uni lol

[@itfreetraining]

Thank you.

[@thomasjones3224]

Your explanation of MX was very confusing.

[@itfreetraining]

What was confusing? Perhaps we can help clear up any confusion. :)

[@itfreetraining]

Thanks very much.

[@Tymonello]

thanks, it is helpful

[@itfreetraining]

Thank you for watching!

[@clovisgrenier]

THANK YOU

[@itfreetraining]

You're very welcome!

[@DzikuS-km8he]

Nice

[@itfreetraining]

Thanks!

[@TahaIsmailCanada]

Thanks so much

[@itfreetraining]

No problem at all. Thanks for watching.

[@farhantanvir9650]

Thank you.