DNS (Domain Name System) is what makes the web work, without it none of our favorite websites could design, we wouldn’t have the ability to test our email, test our Facebook, in fact ninety-nine percent of the network of connections now. Clearly longer tables cannot be used without DNS. So what exactly is it? Well, basically DNS is what converts a domain name (eg google.com) directly into a system-readable IP address.
What is an IP address? Well, it is very necessary that you know what an IP contract is if you are going to learn how DNS works. Basically, every system that communicates over the network uses this IP address. It is a range of four blocks from zero to 255 per block, for example: 24.50.10.Ninety-Nine This is an IP address. I won’t go into any specifics here, but every system that wants to talk on the network uses this transaction to identify itself. Now routers no longer recognize zone names, they know IP addresses better, so converting a domain name to a single name is very important.
Note: Above I am on IPv4 and now it is no longer IPv6
So what does DNS do? – Every time you enter a URL in your browser, your laptop has to look up the IP address with the domain name, it does this through a DNS lookup. Your laptop will prompt you for the number one DNS server for IP resolution (you can test your number one DNS server by going to command mode and typing ipconfig /all)
Way too long for a star, right? Well, the main DNS query will usually be a number system (you as an example) asking the number one DNS server for an IP addressing google.com, and then the DNS server will get the final result and send it back to your system. , the system is now aware of what Google is, or at least addresses it by IP with this data it wants and which allows it to speak.
DNS Hierarchy – Unfortunately not all DNS servers have the whole bottom, the whole DNS database is huge, just think how many tens of thousands, thousands, tens of thousands, thousands of websites there are! This is why there are so many hyperlinks within the DNS chain. At the top of the chain are the root servers, which contain all the answers and consist of all the globally accessible single domain names. However, your laptop will now not suspect them, instead if your number one DNS server now doesn’t understand the solution, it will ask you for its next server in the chain, which is usually your ISP’s DNS server. If that server no longer understands the solution now, it will ask the next server in the chain, and this may continue until the root server is asked if it normally wants to receive the solution.