This tutorial is about how the domain name system works. We will do our best for you to understand this guide. I hope you will like this blog How the Domain Name System Works. If your answer is yes, please share after reading this.
Check the operation of the domain name system
If you want to call someone with your mobile phone, you are very unlikely to enter the exact phone number. Instead, it loads the contact list and searches for the person’s name. DNS does the same when you want to load a website. In some cases, DNS resolution is a one-step process, while in other cases multiple DNS servers must be contacted. The following diagram shows the steps involved in this process and does not take into account the browser cache. The DNS resolution process consists of converting a host name (eg www.example.com) to an IP address compatible with the computer (eg 192.168.1.1).
Every device on the Internet is assigned an IP address, and that address is needed to find that Internet device, much like a street address is used to find a specific home. When a user wishes to load a web page, a translation must occur between what a user types into their web browser (example.com) and the friendly address needed to locate the example.com web page. To understand the process behind DNS resolution, it is important to understand the various hardware components that a DNS query must pass through.
Submit a domain name resolution request
When you type www.phoenixnap.com in a browser, to load the web page, your computer asks for the IP address. Computers do not know in advance where they can find the necessary information, so they try to search the DNS cache and all available external sources.
Find an IP locally
Before going abroad, your computer loads the local DNS cache database to see if it has already requested the IP address of this domain name. Each computer has a temporary cache of the most recent DNS queries and attempts to connect to online sources.
When the DNS cache contains the IP data of the website you are trying to connect to, the page loads immediately. DNS caching speeds up this lookup process because the computer has the information it needs and doesn’t have to send the request back to your ISP.
Contact the ISP and your recursive DNS server to resolve a domain name
A computer’s local DNS cache database does not always contain the data needed to resolve a domain name. In this case, the request goes beyond your Internet Service Provider (ISP) and DNS server.
Once a request is received, the resolver searches its logs to provide the correct IP address. When the necessary information is present in the ISP’s server cache records, the computer retrieves the IP address and connects to the website. If the ISP’s recursive DNS server cannot resolve the domain name, it contacts other DNS servers to send the information back to you. That’s why we call them recursive servers.
Final Words: How the Domain Name System Works
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