What is the use of DNS system?

Answer 1

it is easy to remember www.yahoo.com then its ip address 69.147.114.210 for eg. u can still access yahoo by typing the ip instead of the name if u like.

DNS resolves the names for you. this is why if you try to access a site which does not exist the the DNS error comes up.

rgds
bhaskar

Answer 2

1

Answer 3

The Domain Name Service (DNS) stores and associates many types of information with domain names; most importantly, it translates domain names (computer hostnames) to IP addresses. It also lists mail exchange servers accepting e-mail for each domain. In providing a worldwide keyword-based redirection service, DNS is an essential component of contemporary Internet use.

DNS's most basic use is to translate hostnames to IP addresss. It is in very simple terms like a phone book. For example, if you want to know the internet address of en.wikipedia.org, DNS can be used to tell you it's 66.230.200.100. DNS also has other important uses.

Pre-eminently, the DNS makes it possible to assign Internet destinations to the human organization or concern they represent, independently of the physical routing hierarchy represented by the numerical IP address. Because of this, hyperlinks and Internet contact information can remain the same, whatever the current IP routing arrangements may be, and can take a human-readable form (such as "wikipedia.org") which is rather easier to remember than an IP address (such as 66.230.200.100). People take advantage of this when they recite meaningful URLs and e-mail addresses without caring how the machine will actually locate them.

The DNS also distributes the responsibility for assigning domain names and mapping them to IP networks by allowing an authoritative server for each domain to keep track of its own changes, avoiding the need for a central registrar to be continually consulted and updated.


For more Info see here:
http://en.wikipedia.org/wiki/Domain_name_system
http://www.isc.org/sw/bind/docs/dns-paper-originit.pdf

All the Best.

Answer 4

Primarily, DNS (Domain Name Service) resolves host names to IP addresses, and vice-versa. For example, when you type "answers.yahoo.com" into your web browser, the browser then uses DNS to look up an IP address associated with "answers.yahoo.com".

It's like looking up a telephone number in a phone book (except that usually software hides the fact that you're actually talking to an IP address).

IP addresses are usually displayed in "dotted decimal notation" which consists of four separate numbers from 0 to 255, separated by "." -- for example, 209.73.187.220 is an IP address for answers.yahoo.com.

You can also do what is known as a "reverse DNS lookup" which translates an IP address to a name.

To look up names or IP addresses using DNS, try running "nslookup" -- in Windows, click the Start menu, then select "Run..." and type "nslookup".

Answer 5

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Answer 6

DNS stands for Domain Name Service.
Simply saying, the DNS server's task is to redirect you to the correct server when you enter a URL of a webpage. Every server and PC has its unique address on the internet, and this address consists of 4 blocks of numbers, every block can be between 0 and 255 (e.g. 69.147.114.210). So the DNS server converts the address you enter (www.yahoo.com) to the address of the server (69.147.114.210) ad this way your computer can find the other one.

Answer 7

The DNS or Domain Name System (server) resolves a human readble domain (like www.yahoo.com) to a set of numbers which point to the computer on which the web site is hosted. (That was in simple english :-)
For details refer http://www.webdevelopersnotes.com/hosting/web_hosting_for_domain_name.php3

Answer 8

DNS is an Application-level protocol for translation of human-readable domain names to numerical IP addresses

The whole DNS system is hierarchical with untold number of DNS servers that responsible to safe-keep its translation "phonebook" and to properly delegate the look up for entries not in its own phonebook.

Answer 9

Web addresses are human readable names, eg "www.yahoo.com"
The computers where sites are stored are actually rrecognised by numbers (IP addresses). The DNS server stores the link between the name and the IP address for the computer.

Answer 10

Domain Name System (DNS) is a database system that translates a computer's fully qualified domain name into an IP address.

Networked computers use IP addresses to locate and connect to each other, but IP addresses can be difficult for people to remember. For example, on the web, it's much easier to remember the domain name www.amazon.com than it is to remember its corresponding IP address (207.171.166.48). DNS allows you to connect to another networked computer or remote service by using its user-friendly domain name rather than its numerical IP address. Conversely, Reverse DNS (rDNS) translates an IP address into a domain name.

Each organization that maintains a computer network will have at least one server handling DNS queries. That server, called a name server, will hold a list of all the IP addresses within its network, plus a cache of IP addresses for recently accessed computers outside the network. Each computer on each network needs to know the location of only one name server. When your computer requests an IP address, one of three things happens, depending on whether or not the requested IP address is within your local network:

If the requested IP address is registered locally (i.e., it's within your organization's network), you'll receive a response directly from one of the local name servers listed in your workstation configuration. In this case, there usually is little or no wait for a response.


If the requested IP address is not registered locally (i.e., outside your organization's network), but someone within your organization has recently requested the same IP address, then the local name server will retrieve the IP address from its cache. Again, there should be little or no wait for a response.


If the requested IP address is not registered locally, and you are the first person to request information about this system in a certain period of time (ranging from 12 hours to one week), then the local name server will perform a search on behalf of your workstation. This search may involve querying two or more other name servers at potentially very remote locations. These queries can take anywhere from a second or two up to a minute (depending on how well connected you are to the remote network and how many intermediate name servers must be contacted). Sometimes, due to the lightweight protocol used for DNS, you may not receive a response. In these cases, your workstation or client software may continue to repeat the query until a response is received, or you may receive an error message.
When you use an application such as telnet to connect to another computer, you most likely type in the domain name rather than the IP address of that computer. The telnet application takes the domain name and uses one of the above methods to retrieve its corresponding IP address from the name server. A good analogy is to think of DNS as an electronic telephone book for a computer network. If you know the name of the computer in question, the name server will look up its IP address.

Within most Internet applications, you will not see the IP address of the computer to which you're connecting. If you want to find the IP address of a particular computer, refer to the appropriate Knowledge Base document listed below:

In Mac OS X, how do I find out the IP address or domain name of another networked device?

In Mac OS, how do I find the IP address or domain name of another networked device?

In Windows NT, 2000, and XP, how can I find the IP address of another networked computer?

In Unix, how do I look up IP addresses?