This tutorial is about the How Domain Name System Works. We will try our best so that you understand this guide. I hope you like this blog How Domain Name System Works. If your answer is yes then please do share after reading this.
Check How Domain Name System Works
If you want to call someone with your mobile phone, it is very unlikely that you will enter the exact phone number. Instead, it loads the contact list and searches for the person’s name. DNS does the same thing when you want to load a website. In some cases, DNS resolution is a one-step process, while in other cases, multiple DNS servers need to 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 involves 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 house. When a user wants to load a web page, a translation must occur between what a user types into their web browser (example.com) and the machine-friendly address needed to locate the web page example.com. To understand the process behind DNS resolution, it is important to understand the different hardware components that a DNS query must pass between.
Submit a request to resolve a domain name
When you type www.phoenixnap.com into a browser, to load the web page, your computer asks for the IP address. Computers don’t know in advance where they can find the necessary information, so they try to search the DNS cache and any 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 for that domain name. Each computer has a temporary cache of the most recent DNS requests and attempts to connect to online sources.
When the DNS cache has the IP data of the website you are trying to connect to, the page loads immediately. The DNS cache speeds up this lookup process because the computer contains the information it needs and does not have to resend the request 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 that case, the request goes beyond your Internet Service Provider (ISP) and your 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 cached records of the ISP server, the computer retrieves the IP and connects to the website. If the ISP’s recursive DNS server cannot resolve the domain name, it contacts other DNS servers to return the information to you. That’s why we call them recursive servers.
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