All about the DNS Domain Name System

by: Jean Pardue

DNS Domain Name System

The more you understand about any subject, the more interesting it becomes. As you read this article you'll find that the subject of DNS names is certainly no exception.

All of us who are on the Internet every day know that in the world of domain names today, the presence of the DNS domain name system is very important.

It is interesting to know that the acronym DNS actually stands for Domain Name System/Service/Server. However, I will be using the term DNS domain name system here to provide you with a clear knowledge about the meaning of this particular system.

 

DNS translates and transforms   The DNS domain name system is indeed a dominant tool that contributes a great part in the domain name process. It is often described as an Internet service that translates or transforms the domain names into an IP or Internet Protocol address.   Now that you know the basic function of the DNS domain name system, it is also interesting to learn that a basic possession of the DNS domain name system is caching. This property takes place in situations when a server welcomes information about a mapping, it caches that information.

Therefore, with such function, a later question for similar mapping can use the cached output, and will not result to additional questions to other servers. And generally, the DNS domain name system applies the caching to optimize the cost of the search. But how does the DNS domain name system caching works?

In terms of caching, it is good to know that every server has a cache for currently applied names along with records of where the mapping data for a particular name was taken. When a particular client ask the server to decide on a certain domain name, the DNS domain name system then checks to see if it has the power for a domain name, and if it does, the system doesn’t need to cache the information.

However, if it has no authority for a domain name, the DNS domain name system then checks its cache whether the domain name has been resolved currently, and if it has authority, the DNS domain name system reports the caching data to its clients.

Think about what you've read so far. Does it reinforce what you already know about DNS names? Or was there something completely new? What about the remaining paragraphs?

There are some occurrences when the DNS domain name system cache can be examined and the system cached the data once, but did not adjust it. Due to the fact the information about a certain domain name can be changed, the server may have incorrect data in its caching table. There is a certain value known as the Time to Live or known as TTL which is applied when to age the information. Whenever an authority replies to a request for a domain name, it then involves a Time to Live value in the answer which indicates how long it assures the binding to linger.

So now you know a little bit about DNS names. Even if you don't know everything, you've done something worthwhile: you've expanded your knowledge about the Internet.

 

Jean Pardue is a freelance article writer and can be contacted at speed-writer@hotmail.com . She also writes for her husband, Bob Pardue, who is a stock photographer. http://www.parduephotos.com

 

If you would like to have articles to list on your website or in your publication please contact Jean for availability and usage rate information.

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