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What is the Domain Name System DNS


Domain Name System (DNS)?

Domain Name System (DNS) is one of the most important services of the Internet. Its job is to allow proper access to websites and other Internet services. Whenever we type the URL of a website in the browser, DNS finds the IP address of that website and takes us to that IP address.


Introduction to DNS :-

DNS means Domain Name System, whose job is to find the IP address of domain names and take us to it. Every apparatus connected to the digital superhighway possesses a unique Internet Protocol (IP) address. DNS enables it. So that it is easy for the user to remember it. And there is no need to remember the IP address.


Function of DNS :-

The job of DNS is to convert domain names into app addresses. For example, when we type the URL of a website, the DNS server converts that domain name into an IP address.

1. Carrying of domain name: When we type the name of a website, its web browser does a DNS carry out.

2. Root DNS Server: First of all, the browser connects to the root DNS. And it tells which type of server can provide the domain name information.

3. TLD (TOP LEVEL DOMAIN) DNS Server: Top-level domains include .COM and .IN.

4. Authoritative DNS: Lastly, the authoritative DNS server works to provide the IP address of that domain.


Parts of DNS :-

1. Domain Name Space: Domain name space is a structure in which the name of all domains and its data is stored.

2. DNS Server: The work of the DNS server is to convert domain names into IP addresses. Along with this comes the root server, TLD server, and authoritative server.

3. DNS Resolver: DNS resolvers look at the user's request and take it to the correct DNS server.

4. Records: This is the database of DNS. Many types of records are stored here, such as A records, MX records, CNAME records, etc.


Functioning of DNS :-

This system is divided into 4 parts.

1. DNS carry: When a user types a domain name, a carry is generated.

2. Carry processing: This carry is processed through the root server, TLD server, and authoritative server.

3. IP address acquisition: The IP address of the domain is known from the authoritative server.

4. Connection: A connection is made between the user's browser and the server. Then the website loads.


DNS security :-

It is necessary to secure DNS. Because it is also used for cyber crimes. DNSSEC (DNS Security Extensions) is used to make the DNS system secure.


Types of DNS :-

1. Forward DNS: The work of forward DNS is to convert a domain name into an IP address.

2. Reverse DNS: The work of reverse DNS is to convert IP addresses into domain names.

3. Caching DNS: The work of caching DNS is to store data in the cache to make the resolution high speed.

4. Dynamic DNS: The work of dynamic DNS is to update the IP of the user's network.


Advantages of DNS :-

1. Convenience: By using DNS, we do not need to remember the IP address.

2. Extensibility: It is very easy to add new domain names in the use of DNS.

3. Security: By using DNSSEC, the security of DNS increases.


Conclusion :-

Domain Name System (DNS) is used more on the Internet. It helps in identifying websites on the Internet. It is very difficult to navigate on the Internet without DNS. That is why DNS is used more. And this is important for internet users.

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