Domain Name System- Linux

DNS is an composition of Domain Name System and it’s widely used in distinct channel. As the name suggests, DNS is a naming system that gives a name to any computer or service connected to a network. DNS is absolutely important and everyone should use it. Without it, we’d have to visit websites through their IP addresses, rather than their domain. So, for example, if you wanted to visit our website through it’s IP address, you’d have to go to 209.135.140.30. But with DNS, you can go to rosehosting.com . It’s accessible to retain and it’s more user-friendly. That’s why people examine DNS “the phone book of the Internet”. Nobody wants to remember an IP, but everyone can and does remember a domain name.

Now we Discuss the DNS briefly with the Linux Training in Chandigarh :

How does DNS work?

There’s lots of stuff going on “behind the scenes” when you visit a website. There’s a communicating relationship between a few servers and your computer. These are the usual steps they take:
1. The user enters the website’s domain in the address bar
The DNS explanation system begin when a user types in a domain name/address in the URL bar of his web browser. With that, the user essentially requests the IP address of the domain and waits for a response.
2. The browser and OS check their local cache
After a user desire instructions on a domain, the user’s OS and browser investigate their local cache for any information on that domain. If the domain is already in the cache, the browser returns a positive response, if not, the Resolver needs to be contacted.
3. The Resolver checks the local cache
 
In maximum cases, the resolver is absolutely your ISP. First, the resolver analysis to see if there’s any local data available. If not, he contacts the domain’s root server.

 What is a root server you ask?

Well, a root server is a name server that covers the root zone of the Internet’s Domain Name System (DNS). It answers desire for report in the root DNS zone among other requests. For example if a request is received and asks what are the authoritative name servers for rosehosting.com it will return the authoritative name servers for the respective top-level domain (TLD). The root name servers are the primary indication in resolving civilized clear host names into IP addresses thus making them a critical part of the Internet infrastructure. There are thirteen root name servers specified in the world. But don’t let this information scare you. It does not mean that there are only thirteen existing physical servers. They each have redundant equipment in place that provides reliable service even if failure of hardware or software occurs. Additionally, the root name servers operate in multiple geographical locations that use a routing technique called anycast addressing. Wikipedia’s explanation for any cases addressing is: a network addressing and routing process in which datagrams from a single sender are routed to the topologically nearest node in a group of potential receivers, though it may be sent to several nodes, all identified by the same destination address.

CBitss Technologies is the best place for Linux Training in Chandigarh.If you want to learn more about DNS so please join this course .