So let's talk about this business business stands for the one name server.
So what does the minimum server?
This is the initial results, but when the IP address.
So domain name.
Some other domain name examples are guru.com, Microsoft dot com and Agil dot com, etc. So these are
the and you can access these domain names.
Are the websites using the browser?
You type in the browser, Google dot com and you will get the homepage of the Google Google dot com.
But actually.
You need to contact the IP address of the Web server and you need to get the homepage, but we are accessing
the domain name because you you cannot remove the IP addresses of our site.
Right.
You may remember one or two websites, IP address them, but you cannot remember every other IP addresses.
So you want to what these network guys did is they have created this DNS server and this being a server
Stoss are these domain names and that I spoke to IP addresses whenever you want Google dot com, these
DNS server tells you the IP addresses of that guru.com observers.
So you can just.
Take the Google to come, and this business tells you the IP address for you, and then you get the
Web server, I mean homepage.
So Dina's actual phone book.
So if you have a phone book, you can have your friend's names and you can have that phone number,
you cannot remember the phone numbers of 100 friends are two hundred.
And so that's what you use for phone book, contains their name to the phone number of maybe the same
DNS contents, the domain names to the IP address.
So let's see how this business works.
So I have the piece you want.
This is my computer piece you want.
And I want to get the home of the Google dot com in browser.
I like the Google column and this browser contains some cash and in the KARRAKER cache it searches for
Google dot com Sapientis if I am for visiting the Google dot com website.
Then the cash does not contain any entry, if I have ordered it put 100 times, then the cash that the
that comes by my name and that I purchase.
But let's assume that I am typing a guru.com since my brother does not have any cash.
Then this request will be sent to the ISP Internet service provider, your wife, a provider or some
third party, some Verizon providers.
So ISP also contains some cash.
If even though in that cash our courier comes IP at the center is not there, then ISP fraud was this
request to the root server.
So another good outcome is adept at that.
This the root server and this root server does not do anything except it knows about this building servers.
This deal stands on top of other domain and this coupledom enter dot com, dot org, dot net.
And these are the famous popular domains.
And whatever your request was and why you speak to these other Goulder come this route server identifies
this.
Uh, dark, and then it was under the cost to the respective server.
So this year the server contains the dot com, dot net and dot org server.
So unseen Google dot com.
This particular dot com theaters are responses because it is dot com and they are the servers.
This dot com tildy server transfer, that is the IP address of these name servers to this ISP.
So it is IP addresses.
ISP can contact this name servers so that these names can actually contain this Google.
So these names always contains only the names like Google, Microsoft, and within that Google, it
will have to respond to IP addresses.
So names are on the scene that be for the Google.
Then the corresponding IP address in the table from the Google is sent to the ISP.
Then I speak cash in its database or sent to the PC world.
So no ISP since the IP address are the Google computer perceiver.
And this computer will initiate the connection to that IP address using TCP prevention and get the webpage.
So you don't see this process when you're accessing just Google.
Can you just take Rock'em and you get the webpage?
But these are process just, uh, completing a fraction of seconds.
That's why you see just Google Comesa one web page.
So let's see.
These names are also very important for from the point of view and these names Chavez holds, some papers
are like entries.
These are called business records.
So DNS records contain some mappings, fustiness records, as you can see here, blogs and you want
to ask for these records, contain this IP address.
And if anyone asks for zero and this IP address is featured and in the same way, if anyone asks for
this, IP addresses Fitchett.
So these are the very useful and very commonly used records.
And it makes it cuts and makes sense for me to exchange cuts if any company wants to use the main server
and it has some priority during the highest priority.
And the email will be sent by this server because it's priority zero.
And if this e-mail server is off or any good, if it went to any maintenance purpose, then the next
private email server will be used.
This is causing them to cut.
It also stands for Canonical.
Now, suppose you have some blog and in the blog post.
In that blog Web site, it is.
It is pointed by the donor.
So whenever who don't you do the blog that I am a robot leader.
So what this user, this character name is is the IP address of this website is all of this web server
is constantly changing.
You need to update all these records, those many times.
So in order to avoid the time consuming, you just point to this website and this website points to
another IP address, which is constantly changing, which you do not get because you just point the
donor to the browser or whatever.
OK, that is the current column.
So these are the main business records you need to know.
And you need to know one more concept called the stone transfer so you can see these are the names there
was no my organization can help more than one names are so positive.
I have three names.
Was these three names or was they just the.
IP addresses from these requests and turns to the computer.
OK, that's fine.
So what this security so other security risk lies in same services.
If if you can figure out these names are was me and they can transfer into these records to anyone.
Right.
If one name fails, then the backup will be sent to the other names.
This is called the transfer.
So if I say that anyone can access this transfer, I mean, if anyone can access the records, these
names, servers can send any one this DNS records.
So that is one security issue because ongoing are these subdomains are many servers and anyone can it
increases attacks, surface area and anyone can try to help them.
And one important thing is if you have some hefting websites here and those websites are highly prone
to these attacks.
So that's why you need to configure these servers to not to send the business records to anyone.
So you see this DNS don't transfer in business enumeration with the practical example.