DNS Records (part 2)

Video Activity

DNS Records This lesson focuses on DNS Records which consist of the following: - A: Address Record; Fully Qualified Domain Name (FQDN) - AAAA: IPv6 address record; lets us know a Fully Qualified Domain Name (FQDN) - CNAME: Canonical name (e.g., salesdoc.cybrary.local) - MX: Mail exchange; allows client to connect to a mail server for a domain (eg c...

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Time
31 hours 29 minutes
Difficulty
Beginner
CEU/CPE
30
Video Description

DNS Records This lesson focuses on DNS Records which consist of the following: - A: Address Record; Fully Qualified Domain Name (FQDN) - AAAA: IPv6 address record; lets us know a Fully Qualified Domain Name (FQDN) - CNAME: Canonical name (e.g., salesdoc.cybrary.local) - MX: Mail exchange; allows client to connect to a mail server for a domain (eg cybrary.it) - PTR: Pointer; this is what lets the DNS servers do reverse lookups, tells IP addresses

Video Transcription
00:04
we mentioned that our D N s has different records in these different records correspond with different pieces of information.
00:10
We have our AI records
00:14
and then on the left is going to be
00:18
on the left hand. Side is the type is what we refer to these records on, and the right is going to show what these records mean. So we have our d. N s A records and a record stands for an address record and in an address record is a standard, fully qualified domain name to I p address record.
00:37
So an address record is going to tell us that sales dot cyber ery dot local is equal to 1 92.1 68.1 dot 17. That will be our address record.
00:53
Next, we have our
00:55
quadruple a record.
00:57
This is going to stand for our I p V six address record won't lie. Four A's Well, when we think about our i p addressing schemes again, our I P V four address is a 32 bit address. Our I P V six address is a 128 bit address
01:14
four times 30 to 128. So that's why we have our four A's for I p v six address record. Our I T V six address record will let us know a fully qualified domain name. So sales six dot side bravery the local to an I P V six address. Next, we have a
01:34
canonical name record. So what does this record? D'oh!
01:38
Well, a canonical name record lets us know that
01:42
if somebody is looking for this computer,
01:46
this name actually means this name.
01:49
So say we tight. So say we give everybody
01:53
and address to connect to and we say, OK,
01:57
we want you to search for sales doc
02:00
dot cyber harry dot local and sales Doc is what they're going to enter in to connect to
02:08
now. Let's so for whatever reason, we don't want them to know the actual name of our sales server.
02:14
Maybe we're doing some sort of Maybe we're doing some sort of clustering. Maybe we're doing some sort of transition over to a different server, and we're essentially telling our d. N s server okay, if someone says sales sales doc got cyber dot local, They're actually searching for
02:30
sales dot cyber eri
02:34
dot That cyber harry dot local.
02:38
So I want you to give him the i p address of the A record for sales. That's cyber dot local.
02:46
So
02:47
sales doc dot cyber we got local is actually not a server. We have We don't have a server. We don't have a server name to that. We do have a server named sales dots I buried at local. So are see name record will sort of
03:00
sort of axes are pinned name for our actual sales server so that our clients don't see the actual name of the server. They see what we want them to see,
03:10
and they enter what? That we want them to enter. And then we give them the i P address for the actual computer that they're connecting that they need to connect to.
03:19
Next, we have our mail exchange record.
03:21
Now, our mail exchange record is a very important record because it allows our clients to connect for the mail server for our domain.
03:29
So say if we set up a domain out on the internet
03:34
way, we register the we have registered the cyber dot i t domain
03:38
and then you go into the you go into the
03:42
D. N s information
03:44
four hour registered domain. So you go to whoever is allowing you to register that domain and enter the new D. N s information for that domain. And you say, Okay, I want you to put on the main DNF server for the Internet.
04:01
I want you to put that the server address for
04:06
any mail, any e mails that are going to side, very dot i t go here.
04:15
So if you send an email to if you go in outlook and you send an email to let's say
04:23
help or you send an email to me at cyberia dot i t
04:29
then
04:30
our outlook. Our Gmail is going to essentially go out
04:36
wherever and is going to say, OK, I know where I know that I need to send this to the cyber. I need to send this to blank at cyberia dot i t. Well, what server do I send this to? Because I need to have a server that I give this envelope to. I need to have an address that I give this envelope to. It sort of be like if you wanted to write a letter to,
04:57
um if you wanted to send a letter to Disney World.
04:59
Well, you can't just write Disney World in the upper right hand corner of the envelope. You have to know the address to send that too. So you may look it up online or you may go to the post Office and say, Hey, do you know the address of Disney World that I can put up here because I can't just write Disney World,
05:13
So it's sort of doing the same thing. Our server or Microsoft server or Gmail Server's gonna go to the ah main server for are the authoritative server for cyber harry dot i t or whichever Dean s service hosting that domain and is going to say, Hey, do you know who the mail exchange server is?
05:31
Because it may not be mail dot cyber dot i t. It may be something completely different.
05:36
It may be hosted on the email for cyber dot i t maybe hosted on Gmail,
05:43
maybe hosted on outlook may be hosted by Microsoft. That's why you don't necessarily have to have a at Gmail address. If you're using Gmail for your environment, you could have a
05:55
at school at school dot edu adress and use Gmail You for to process all your email because you're just going into whoever manages your d. N s. And you're saying any e mails sent to our domain, anything sent tow us as an email
06:12
needs to go to this server. So that's what a male exchange record does. Mail exchange record. Let's
06:17
other servers. No, let's other computers know that. Oh, hey, if you're looking to send me a letter, if you're looking to send me an email, this is the server you send it to. So again, sort of like if we can just we can't just write Disney World in the upper right hand corner of our envelope. We actually have to know the address Where to send that
06:39
in computer speak. We can't just send an email to cyber dot i t.
06:44
Without knowing the address of the server that we actually
06:47
put that email into the boat into the into the thing that you have outside your your house. The mailboxes? Yes,
06:56
we have to actually put it in the mailbox. You have to actually give it to the server so that they have the email.
07:01
So that's our mail exchange records. So
07:04
we'll just put email there.
07:08
And then lastly we have or are Pointer records are PTR records now. Pointer Records are what let our server are. Let Deena Service do reverse Lookups Pointer records
07:18
tell
07:20
I p address
07:23
so 1 92.1 68 1.17 to
07:29
sales
07:30
dot cyber eri
07:33
not local.
07:35
So that's what our pointer address is going to do. Remember, Our address records are a records are for Ford Lookups on lee
07:45
and then our PTR records are going to be for reverse lookups.
07:50
So from the i p address to the fully qualified domain name and then address records are going to be fully qualified domain name to our i p address.
08:00
So thank you for joining us here today at cyber dot i t. Today we talked about our d. N s information, all of the different components and the different processes that d. N s goes through in order to allow us to find out where certain websites live.
08:13
We talked about our d N s servers and RG NS clients. How are Dina servers provide us with different records
08:20
that we can resolve our fully qualified domain names too.
08:22
So hopefully this information was helpful and was very informative and that you'll be able to use it to go forward and be able to set up D N s servers or just use this information for an exam. And most of all, we hope to see you here next time on cyber dot I see.
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