Hello Friends, In this blog post I am going to let you know about the DNS(Domain Name System or Server). In this post, you will see why do we need to have the DNS, and what is the function of DNS or how does it work?
Inside this blog post, we are going to explore What is a domain name server? How do I find my domain name server? How DNS works step by step? What is the domain name system with an example?
The program rarely refers to mailboxes, hosts, and other resources, by their binary network addresses. Instead of binary numbers, they use ASCII strings. Nevertheless, the network only understands the binary addresses, so some mechanism is required to convert the ASCII to network addresses.
In the past of ARPANET, there was simply a file, host.txt that contained all the hosts and their IP addresses. Each night, all the hosts would fetch it from the site at which it was maintained. This approach is well for a network of a few hundred large timesharing machines.
However, when thousands of workstations were connected to the net, everyone realized this approach could not continue to work forever. For one thing, the size of the file would become too large.
However, even more, important hostname conflicts would occur constantly unless names were centrally managed, Something unthinkable in a huge international network. To these problems, DNS(Domain Name System) was invented.
The essence of DNS is the invention of a hierarchical, domain-based naming scheme and a distributed database system for implementing the naming scheme.
The primary use of DNS is for mapping hostnames and email destinations to IP addresses but can also be used for another purpose. The DNS is a distributed database. It is used by TCP/IP applications. We use the term distributed because no single site on the internet knows all the information.
Each site maintains its own database of information and runs a server program that other systems across the internet (clients) can query. The DNS provides the protocols that allow the client and servers to communicate with each other.
On Unix hosts, the resolver is accessed primarily through two library functions, gethostbyname, and gethostbyaddr, which are linked with the application when the application is built.
The first takes a hostname and returns an IP address, and the second takes an IP and looks up a hostname. The resolver contacts one or more name servers to do the mapping.
The resolver is normally the part of the application. It is not part of the operating system kernel as are the TCP/IP protocols. RFC 1034 specifies the concept and facilities provided by DNS, and RFC 1035 details the implementation and specifications.
Quick and Important Q&A:
What is a domain name server?
DNS stands for domain name system. The function of DNS is that it takes the domain name as the request query and then returns the corresponding IP address of that domain. DNS(Domain name server is a collection of domain names and IP) maps the domain name with their IP address.
Whenever we type a domain name in the browser then it actually pastes the IP address sent from the DNS server. But this process is very fast so that we can not even see and feel it visually by seeing on the screen.
How do I find my domain name server?
There are various ways by which you can easily identify your domain name server. You can look it into your hosting account with your control panel access. You can check it by who is hosting or the WHOIS LOOKUP tool for searching your domain name server.
How DNS works step by step?
See the steps given below:
Step 1: Request for the Website Information.
Step 2: Contact the Recursive DNS Servers.
Step 3: Query the Authoritative DNS Servers.
Step 4: Access the DNS Record.
Step 5: Final DNS Step.
What is the domain name system with an example?
The main work of the domain name system is to map the website name or domain name( which is generally access or types by the users on the browser) with their corresponding IP address and then sent it back to the browser.
This DNS system is build because it is not easy to remember the IP addresses of several websites and type them again and again. So for making it user-friendly the concept of domain name brought to light.
Here user does not need to type the IP address of a website instead he just type the name of the website or domain name of the website and the rest of the process like requesting the IP address from the DNS server and paste it in place of the name of the domain is an automatic process and the user does not even sense this process visually on the screen.
Within this blog post, we have gone through What is a domain name server? How do I find my domain name server? How DNS works step by step? What is the domain name system with an example? DNS name server, DNS server meaning, authoritative name server
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