What is DNS and how does it work?


DNS Full Form: Do you know what is DNS? What is the full form of DNS? How does DNS work? “DNS” is a system that converts the URL of a website into an IP address. Without DNS, you will have to type the full IP address when you visit a website.

Today in this post I am going to tell about DNS in detail . If you also want to know what is DNS kya hai, what is the full form of DNS ? So read this post completely.

Generally, to visit a website on the Internet, we use its URL. If we start remembering the IP address of a website instead of the URL, then this task will be very difficult. Because, this means, you must have a complete list of the IP addresses of the websites you visited and enter them manually. That ‘s why DNS was used and this task was made easy. Here we are going to explain in detail how DNS works? Before this, let us know what is the full form of DNS?

Full name of DNS

The full form of DNS is ‘Domain Name System’. Sometimes it is referred to as Domain Name Server or Domain Name Service. DNS was invented in 1983 by Paul Mockapetris.

What is DNS?

DNS is a type of database where a list of all domain names according to each IP address spread across the world is stored.

It is usually difficult to remember an IP address. So when you type a domain name into your browser’s search bar and hit enter, you have a DNS server convert this domain name to the corresponding IP address and arrange your communication with it.

In this task each networking operating system uses a type of software called a DNS resolver, which helps in finding the IP address.

Just as the phonebook present in our mobile gives us information about all the calls, in the same way the Domain Name System is also the phoneook of the Internet. For example: – People get information online through, in the same way web browsers understand each other through IP address.

The Domain Name System (DNS) translates the domain name into an IP address, due to which the browser is able to load the resources present in the Internet.

What is the history of DNS? (What is the history of DNS in Hindi?)

Till now, there are about 2 billion websites all over the world and their number is increasing. The Internet has become so widespread that a new website is ready in almost as long as we open a website.

It is difficult for all of us to remember the different types of IP addresses of our favorite websites. That is why to solve this problem, Paul Mockapetris invented the Domain Name System in 1983 at the University of California, Irvine. In 1984, 4 students at UC Berkeley wrote the first Unix name server implementation, called the Berkeley Internet Name Domain (BIND) server. Unix system is still the widely used server in DNS server. 

The DNS server system is working very widely and right now its demand is very high on the Internet. At the same time it also provides excellent facilities. Many people have done many experiments on this, out of which the Unix server system is working the best and it has also been developed a lot, so that any customer working in it does not face any problems.

What are top level domains? (What are the Top Level Domain in Hindi?)

Top level domain is the domain name system of the Internet, in which the highest level domain name is called Top Level Domain, which is placed at the end of all websites and with the help of which we can reach the original page of the website. It includes .com, .in, .org, .edu, etc.

According to the data of Internet Corporation Assigned Name and Numbers (ICANN) , the number of top level domains is about 1505.

What are domain names? (What is Domain Name in Hindi?)

A domain name is a type of name address. We use this to reach the original page of the website. With the help of domain name, we do not have to remember the numbers of the IP address.

What is Sub-Domain (What is Sub-Domain in Hindi?)

Whenever we create a website, we first have to buy the domain name, which is found at the end of the website. After this, we select the sub-domain and put it in the beginning. This includes & Hindi.mysterious etc.

What is FQDN (What is FQDN in Hindi?)

FQDN Domain full form is FULLY QUALIFIED DOMAIN NAME. It has a Host and Top level Domain. With its help, it is used to determine the exact location of the webpage and web browser for all the customers.

What is a DNS sequence? (What is DNS Hierarchical in Hindi?)

Domain Name Server is a hierarchical and decentralized naming system of domain names present in the Internet. This means that it organizes the domain names available in the Internet and makes them available in tree structure.

Types of DNS Servers

There are three types of DNS servers which are as follows –

  1. DNS Resolver.
  2. DNS Root Server.
  3. DNS Authoritative Server.

What is DNS Records (What is DNS records in Hindi?)

DOMAIN NAME SYSTEM keeps records of all DNS servers and records of all IP addresses in a very well organized manner. This is what we call DNS records.

What are the types of DNS records? (How many types of DNS Records in Hindi?)

The information requested by the user in the DNS system is called a DNS record. Many types of information can be requested in the DNS system. That’s why there are many types of DNS Records. Here are some of the most common DNS records.

A record or address record It stores information about hostname, time to live (TTL), and IPv4 address.

AAA Record – This stores hostname information and the IPv6 address associated with it.

MX Record This specifically records a domain’s SMTP server used for e-mail exchange.

CNAME Record – It is used to redirect a domain or subdomain to an IP address. Through this one function, you do not need to update your DNS records.

NS Record It refers to the sub domain on the desired official name server. This record is useful if your subdomain on your web hosting is different from your domain.

PTR Record – This allows the DNS resolver to provide information about the IP address and display the hostname (reverse DNS lookup).

CERT Record – It stores Encryption certificate or Security certificate.

SRV Record – It stores information related to communication places, such as Priority, Name, Port, Point and TTL.

TXT Record – It carries and transmits data which can only be read by machines.

SOA Record – This is the section that appears at the beginning of the DNS zone document. The same section refers to the official name server as well as complete information on the domain.

Less frequently used DNS Records:

• AFSDB ( AFS Data Base Location).

• ATMA (Asynchronous Transfer Mode Address).

• CAA (Certification Authority Authorization).

• DNAME (Non-terminal DNS Name Redirection).

• LOC (Location Information).

How does DNS work? ( How DNS works in Hindi?)

As I mentioned earlier, DNS is a central part of the Internet that converts domain names into IP addresses. Let us understand step by step how DNS works.

Step 1: Website Information : – As soon as we search the domain name of the website we want to go to in the computer, the Resolve process starts and DNS queries are generated.

Step 2: Local DNS cache to query resolve : – First of all our computer finds Associate IP address with the help of domain name and on getting it, the computer starts showing us website information on the browser.

Step 3: Contacting the DNS server : – If the computer does not get the information of the website, then it gets connected to the DNS server present in its system by generating a new query.

Step 4: Send query to Recursive DNS server : – Nowadays there are many DNS servers on the Internet. Many people use their own servers and Recursive DNS servers keep only top level domain servers. 

When the computer sends the DNS query to the recursive DNS server, the computer searches the domain name in the DNS cache, if it is found, then the problem is resolved.

Step 5: Send query to authoritative DNS server :- Authoritative DNS server keeps each DNS records with itself and all servers send problems to this server. Authoritative sever resolves all DNS queries.

FAQs Related to DNS (Domain Name System)

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Written by Sapna Verma

Linguist-translator by education. I have been working in the field of advertising journalism for over 10 years.

For over 7 years in journalism. Half of them are as editor. My weakness is doing mini-investigations on new topics.

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