Solved

what is DNS?

Posted on 2009-04-01
6
510 Views
Last Modified: 2013-11-10
what is DNS?
0
Comment
Question by:YRich
6 Comments
 
LVL 5

Accepted Solution

by:
pghn earned 100 total points
ID: 24041072
The Domain Name System (abbreviated DNS) is an Internet directory service. DNS is how domain names are translated into IP addresses, and DNS also controls email delivery. If your computer cannot access DNS, your web browser will not be able to find web sites, and you will not be able to receive or send email.

The DNS system consists of three components: DNS data (called resource records), servers (called name servers), and Internet protocols for fetching data from the servers.

The billions of resource records in the DNS are split into millions of files called zones. Zones are kept on authoritative servers distributed all over the Internet, which answer queries based on the resource records stored in the zones they have copies of. Caching servers ask other servers for information and cache any replies. Most name servers are authoritative for some zones and perform a caching function for all other DNS information. Large name servers are often authoritative for tens of thousands of zones, but most name servers are authoritative for just a few zones.
0
 
LVL 43

Assisted Solution

by:JFrederick29
JFrederick29 earned 100 total points
ID: 24041078
Hostname to IP Address mapping.

www.google.com = 74.125.93.147

http://en.wikipedia.org/wiki/Domain_Name_System
0
 
LVL 7

Assisted Solution

by:computerfixins
computerfixins earned 100 total points
ID: 24041265
Simpler terms:

Yellow pages for the internet. :)
0
 
LVL 14

Assisted Solution

by:Geisrud
Geisrud earned 100 total points
ID: 24042106
Like the other gents said, it allows you to use more user-friendly names to get to a website, like when you type www.experts-exchange.com into your web browser of choice.

Your computer then communicates with other computers and learns that, as far as the Internet is concerned, www.experts-exchange.com is the same as 64.156.132.140 (which you can also type into your web browser!).
0
 
LVL 26

Assisted Solution

by:PCBONEZ
PCBONEZ earned 100 total points
ID: 24055620
In English... LOL
It's basically a Noun to Digital name converter service.

An IP address looks like: 64.156.132.140
It is 'like' a phone number to a computer or to a networking device. [Like a Router.]
Using TCP/IP computers actually connect and communicate using IP Addresses.

DNS is basically 'a library' function that keeps a record of the noun names humans assign to devices at various IP addresses.

~~~
Lets assume your LAN has a PC 'Named' "HIS" and another named "HERS"
The IP for "HIS" is 88.88.88.88
The IP for "HERS" is 44.44.44.44
[These numbers are totally bogus by the way.]
~~~

If you are on HIS and you want a file on HERS then having DNS enables you to type in "HERS" to get to the file instead of typing in "44.44.44.44".
.
Some computer(s) (or some Routers and Switches can do it) on you network need(s) to be designated as the DNS Server and have that Service enabled. That's the device where the library records are PHYSICALLY stored. When you type in "HERS" your PC asks the DNS Server what the IP Address is for HERS and it connects to HERS using the IP Address.
If that/those device(s) is/are off you may have problems accessing other computers.
.
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
For many of us, the  holiday season kindles the natural urge to give back to our friends, family members and communities. While it's easy for friends to notice the impact of such deeds, understanding the contributions of businesses and enterprises i…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

810 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question