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Introduction to DNS (Domain Name Services)
Вставка
- Опубліковано 12 бер 2013
- Info
Level: Beginner
Presenter: Eli the Computer Guy
Date Created: March 13, 2013
Length of Class: 19:17
Tracks
Servers
Networking
Prerequisites
Introduction to Networking
Purpose of Class
This class teaches students the basic concepts for network DNS (Domain Name Services).
Class Notes
DNS is the Server Service that Maps Hostnames/ Domain Names to IP Addresses
DNS and DHCP are different services that are generally hosted on the same server, but can be hosted on separate servers
Dynamic DNS allows DHCP to automatically add Name and IP Address mapping to DNS tables.
Most techs will work with DNS built into Small Business/ Home Routers or ISP Modems. Other variations of DNS are provided by Windows Servers or BIND which is used on Unix and Linux servers.
A DNS implementation may be very simple or very complex. BIND and Windows DNS can have many configurations and options while DNS built into a Linksys Router will only have an On/ Off toggle.
DNS Servers can be configured to query other DNS Servers if they cannot find a result in their tables.
Reverse DNS maps IP Addresses to Hostnames/ Doman Names. This is done for security to verify a connection has not been redirected by hackers.
Resources
www.isc.org/so...
en.wikipedia.or...
truly amazing, way better than expensive textbooks, college classes, and mediocre professors
lol
Honestly!
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I learned more from your half hour videos than I did in a whole year of school
I really like how you explain these stuff. You are a very good teacher! :)
Thanks
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Eli I love how you speak so clear and confident, thank you so much!
Eli, you are the man! Thank you so much for these videos. I'm an IT student and your classes really help clarify some of the questions I have left over after my in class time and other resources. Thanks again and keep it up brother!!!
Great set of videos. I have been a web programmer for a long time now, and getting into IT. I love being able to learn at my own pace, and the internet is such an amazing place to learn things. Thank you for these videos, Eli. You are a fantastic instructor! I dart around a bunch, I think your videos would do well numbered, so I can sort of see soem direction in them. But either way, thank you so much!
You're like the IT Walter White!!! you explain things so passionately and convincingly. so thank you so much
You are the best when it comes to teach online. To the point and very clear understanding methods. I really like your way of teaching.
Respect..!! I really don't like to study any of subject but since when i have watched your videos.. I start studying alot. you made it easier for me.. really ton of thanks !! you are the best teacher of this world wish i could meet you once in my life.....
Hands down, the best IT instructor!
Thank you for what you do Eli! I recommend your videos to anyone who is looking for an outstanding IT channel on YT.
Your awesome.. Its so much easier to understand this way. Most people just go ranting of information and it just gets to hard to understand. This is best UA-cam video I have seen till now on domains
Just love how you make these difficult ideas so so clear, have learned so much only from two of your lessons, and i'll continue doing so. Fantastic work pal!
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You are the best teacher that I have had in a long time. it is very refreshing and a joy to listen your videos.
i would of loved this about 2 years ago, one thing that always got me was the different between local and public domains and how it tied in with AD
As usual, a very informative and well presented lesson. I am so grateful for all of generosity of the work and effort . Thank you Eli!!!
I have no words for your presentation. You are kind and skillful. God Bless.
I'm in a computer networking class right now and we don't have any lessons only books and the internet. I don't know how big the changes it is to 2016 but still it helps a lot when I write my homework. You got a new subscriber :D (sorry for the bad english)
eli you should be awarded for this great work you are doing.
Eli...you are awesome! This is the simplest tutorial I have ever watched on DNS...thanks....
This was so helpful! I have followed you cause of your new videos for a long time, not these older educational ones. But you could definitely do more of them. You explain it very clearly. Thanks!
I think Eli puts things in easy to understand language. Love these videos.
Whenever I search something on youtube, this awesome guy pops up.
Service, system, schmervice...you all get the jist i mean really...BIG picture people. Thank you so much Eli.
Thank you so much for sharing this info with the world. Your clear speech is even helpful for none English speaker like me. You are the best.
The best teachers teach from the heart, not from the book. ~Author Unknown
Excellent videos, so illustratives and becomes the IT World more accesible
This has been one of the most informative videos on youtube, that i have watched. Thank you for spending your time to explain this. I really needed this.
i like the fact that when you speak to as it feels as if you are speaking to deaf people..but i love it because English isnt my first language so it makes things easier for me
Eli you are a great help. I work in Change Management and like to understand the various technologies I work with (gets a little insane when you deal with all of them). You make it easy, thank you sir :)
Spectacular clarity of mind and teaching ability if it was not scripted. Subscribed without a doubt. Going to watch the dns for windows setup vid now.
Thanks Eli - Very clear, concise and to the point also covering other affected technologies!
Thank you so much, I don't know so much about computers network but you did this explanation so clearly for me, thank you.
You are a very good teacher, keep the good work going. God bless u real good.
Hey Eli, thanks for all the lessons. you are comprehensive, u r so elaborate and really really good. You make things so easy to understand.
Thanks man
Eli, I just want to say Thank You very much for all of your help. Your videos are top notch and help me out very much in my networking class. I greatly appreciate it and wish you luck in all of your future endeavors. :-)
Thanks Eli for helping all of us
so we can say that a DNS server is typically your phone's contact list that returns the phone number of the person you locally searched for or else presumably goes to the internet to find that for you?
very well explained and understood . better then my school and college teachers
Very informative straightforward explanation.
Wow Really very useful and understand about your teaching skills. Very impression. Thank you so much for your timing and coaching.
I would like to learning many things from your other classes.
Your video is really amazing....it really clear my concept...doing great work
you are an absolute LEGEND
this has been a platform motivation for me than even learning new things and polishing up my techniques
Another great video, been using a lot of these for my networking course, very helpful. Appreciate all your hard work.
*dynamic host configuration protocol
its really a good tutorial that give you a base of your understanding about DNS... Thanks for the very well explanation.
That was a very good explanation indeed sir. You are an expert in teaching! Thanks a lot Eli :)
DHCP stands for Dynamic Host Configuration Protocol not Control, at least by ISO standards.
...and DNS stands for Domain Name System (not service), according to EVERY RFC!
Host Names
Domain Name Service (DNS) is the service used to convert human readable names of hosts to IP addresses. Host names are not case sensitive and can contain alphabetic or numeric letters or the hyphen. Avoid the underscore. A fully qualified domain name (FQDN) consists of the host name plus domain name.
Domain Name System
The Domain Name System (DNS) is basically a large database which resides on various computers and it contains the names and IP addresses of various hosts on the internet and various domains. The Domain Name System is used to provide information to the Domain Name Service to use when queries are made. The service is the act of querying the database, and the system is the data structure and data itself. The Domain Name System is similar to a file system in Unix or DOS starting with a root. Branches attach to the root to create a huge set of paths. Each branch in the DNS is called a label. Each label can be 63 characters long, but most are less. Each text word between the dots can be 63 characters in length, with the total domain name (all the labels) limited to 255 bytes in overall length. The domain name system database is divided into sections called zones. The name servers in their respective zones are responsible for answering queries for their zones. A zone is a subtree of DNS and is administered separately. There are multiple name servers for a zone. There is usually one primary nameserver and one or more secondary name servers. A name server may be authoritative for more than one zone.
I like the way the guy spells 'IP Address'. Crissspppp..
dhcp+dns = dynamic dns was very usefull. thx... explains a lot of client's dns problems.
Thanks Eli. I love your teaching approach. Your videos are really helpful.
You're pretty amazing at teaching, you help me learn things my tutors in college can't so great job.
You are a good teacher man Bless.
Really enjoying these videos, you are a good teacher Eli!!!
You are the best of the best out there. I really appreciate your easy way of explanation..
you are very awesome.i really apericiate the way how you make things simple.i am very impressed.please try to arrange a full share point course please please
On Windows, type the Windows key + r, then type cmd, then type ipconfig /all, you will see your dns suffix which comes from your ISP, if its a cable provider like Comcast for example you will also be able to check your DNS IP addresses, cuz usually it is more than just one...
How long did it take you from starting off knowing little to nothing about computer networking/security to where you are today?
Great introduction, thank you for giving your time and providing useful information
Yes, I get it. Only configured DNS server can aswer a request, but if this DNS hasn't the IP requested in it's cache, so it will request to some root server that (depending on the TLD or ccTLD) will request to a "registrar" responsible for domains registration, so the registrar will point to the server that owns the registered domain.
Useful refresher and excellent bite-sized learning. Thanks!
thankyou for existing and making these beautiful videos. You are an amazing teacher. :)
Informative mate! Anyone from 2018??
Thanks a lot Eli... You make everything sound easy
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i would love for the next class on dns to be about setting up a bind server.
i would like to see an example of zone config files, records, and the different options and stuff like that being set up.
good vid.
You are really a good teacher, Thank You :)
Eli .. u are the best ... Thanks Eli
good explanation. Your office looks so cozy
So Eli, lets say we have a DHCP pool of 30 addresses and 30 host-names and Dynamic DNS was not configured, when it comes time to configure them are those manual entries on the DNS table or is there a pool of column a (DHCP IP addresses and Column B host names and they just get paired or dynamically assigned for a specific lease time?
Thanks,
Jesse
Its very good tutorial..thanks sir
very informative and I have easily learnt about DNS now, but seriously pause on 12:10 , which toes did you use to draw this with?
Hello Jamie. I think your problem is related to Domain name resolution. First thing you need to do is find the local IP address of the Web server. If you can't access the web server, it is not dns related. If you can access the web server using this IP address, then you need to setup an internal DNS server to translate the the domain name (website) into the LAN IP address of your web server.to be used by computer on your local network. Add a record for the website and point it to the web server.
good explanation......really useful ...,
Eli, different people learn in different ways. It was better when you explained everything using a white board. One can get lost by only listening to you. I really admire and respect what you do, thanks a lot.
Thanks Eli. Very thorough explanation!
Thank you for the lesson.
It will be so glad if it is possible to teach us Linux or Solaris infrastructure administrator session as well.
Once again thank you for you dedication.
You can't have ELI5 without an Eli.
i know that tons of people thank him for his hard work and effort.
but I am honestly grateful that he does this. more than any one would know.
thank you ELI for all your work and effort you put into these videos.
if i had a job currently i would make the largest donation that i could possibly make.
i am a recent network security admin graduate.
and i know....NOTHING... i graduated near the top of my class and i remember just the names of these services. not what they do or how to use them.
and it really sucks, because i get job interviews and i look like a complete fool not knowing how to use these services avidly.
if any one is willing to take me on a "student" i would be for ever in your debt.
Skype: Mr.Kariyo
Thank You
if any one actually helps me out =)
Good Information about DNS .... :-) Thank you . Eli The Computer Guy.
your handwriting is awesome
Hi, Eli, Could you please explain what difference can a domain name registration make? I mean which company to sign up with? any impact on services or it's just web hosting that might effect the website service?
realy , nice video full of basic knowledge. Thanks buddy
How about a class for the non-nerd, non-techs business entrepreneurs who buy a Domain name for their company from one company (GoDaddy?), buying "hosting" for their website through another Hosting company (AWS), and, hosting their "Email" service through another hosting service (BlueHost)
The email hosting company tells you to go to GoDaddy to setup "A" records (????) to point to their IP Address and MX Records (????) to point to their mail (????). And when you go to GoDaddy and access your "Zone" (???) file you see cryptic stuff like A records, MX records, TXT recorts, PTR records etc. with @, mail, and other cryptic things under "type", and you have no idea what those things are!!!!!
Can you simplify this for us non techies with a simple or basic class going through those records and telling us what each record, record type (mail, @ etc.), priority, etc. mean so we can at least communicate with the tech people a little more intelligently?
Thanks!!
Great video, Eli! Thanks for sharing your expertise with us :)
Excellent job, nicely done.
Hi Eli. Since domain and sub-domains exist, what is the at the same time zone existence? And vice-versa. Isn't one's existence reject the other's. Thank you.
Where are the rest of the videos? Why doesn’t he make a playlist? Or am u not seeing it?
In Windows server 2008 r2. If we add a DNS role to make it a DNS server what exactly does it do to make it a DNS server? Do DNS servers maintain a database of computers', applications' DNS name and their corresponding IP? If yes, do all the DNS servers in the world have databases which contain the same data?
i really need help with windows saver 2012 R2, my client computer can only access a website (port 80) on a hosting computer (with windows saver 2012) using an IP address instead of a domain name, but a hosting (local) computer can do both domain name and IP address, (i have installed AD DS, DNS, DHCP) my saver has two network cards both with static IP addresses, can any body help, i only opened port 80
Hey Eli, u r superb. Thank you so much for this class.
Brilliant man! great explanation video, i blessed almost all of his videos.
questions,000..
You're an amazing teacher! Thank you so much!!
The Prior video about configuring AD, DNS and DHCP stated you we're going to have a video to configure DNS and DCHP. Were they created. I cannot find same.
Great explanation sir
Hey Brother, can you help me clear something up in my mind. I want to assign a static ip address to my NAS. Won't put in all the numbers cause you will understand it. I am looki g at 1.100/1.155 that is the range. Now before the 100 (like 99) or after 155 (like 156) Is the range i can work with? Thanks.
Nice explain DNS
Thank u sir
Thank you Mr.Eli
Perfect explanation, you are so good.
Eli thanks again for these videos
Great information, subscribed.