DNS resolution process described in detail

DNS resolution process, generally defined, is a service that uses a domain to reach an IP address. Due to this system, we can access websites easily and quickly just by entering their domain. In our article, we will explain in detail this whole process. 

The definition of DNS resolution

As we have already said, Domain Name System (DNS) resolution is the process of obtaining an IP address through its domain. This is in order to facilitate online users. To visualize what DNS resolution is, we can most easily imagine a phone directory with people’s names. We don’t remember their phone numbers because it’s too difficult. The same principle is working for DNS resolution. Through the domain name, it reaches its IP address.

Need more information? Look at the following article about the DNS resolution!

DNS resolution process

The process from receiving a request for a domain name to finding its corresponding IP address cannot be seen with the human eye. Most online users do not even know about its existence, not even how it works. So we will look at each stage in detail below.

Stage 1: An Internet user sends a request to the resolver server

A user of the Internet enters a domain name into a web browser. Then this request is sent to the resolve server (recursive resolver). The DNS query’s first stop is here. This server caches data. If it has previously searched this site again, it will immediately return its IP. If not, it goes to the Root Server.

Stage 2: Recursive resolver sends the request to root server

The DNS process starts from left to right(has a hierarchical structure). In other words, if we take an example domain exampledomainDNS.com., we will start from “.” and then from .com. So the root server will give us the information for “.”. 

Stage 3: The root server sends a request to the TLD server

The TLD server will give us the information for .com in our example.

Stage 4: TLD server sends the request to Authoritative nameserver

The Authoritative nameserver will give us information about exampledomainDNS.com.

Stage 5: Send a query to the DNS Zone

The DNS Zone will tell us about the IP of the domain. For example, IP address 231.23.45.17

Stage 6: The IP address is sent to the Internet user

The user receives the IP address of the searched domain and successfully loads the site using the Internet and web servers.

This procedure appears to be difficult, but it is completed in milliseconds (in less time than a blink of an eye).

DNS resolution failure – meaning

DNS resolution failure occurs when the Domain Name System cannot resolve a domain (exampledomainDNS.com.) to an IP address (IP 231.23.45.17).

There can be several reasons for this, some of which are:

  1. The most common cause is problems with the Internet connection. (Restart your DNS router or contact your Internet Service Provider(ISP)).
  2. The IP addresses of the DNS server are not correct and valid.
  3. The IP address is not allowed. (To check this, you can use nslookup if you are on Windows).
  4. Ensure that DNS settings are configured to download the DNS IP from the DHCP server.

Conclusion

As ordinary Internet users, we often don’t realize that to find a page, we use the Domain Name System. We can conclude that accessing websites will be very difficult and slow without DNS resolution. Because of it, our Internet surfing is much more enjoyable and easily accessible.

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