The origin of DNS

If you have set up an internet connection for your machine, then you must have contacted the DNS, but what is the DNS? It is said that DNS is used to help memorize the Internet address in order to accommodate human memory thinking. And set.

The full name of DNS is Domain Name System. When you connect to a URL and put www.hotmail.com on the URL, you can use the DNS service. But if you know the IP address of www.hotmail.com, you can also enter this URL by directly entering 209.185.243.135. In fact, the computer uses only the IP address (and eventually 0 and 1). This www.hotmail.com is just for people to remember. Because we humans are more likely to remember some meaningful textual memories (such as www.hotmail.com) than to remember those that have no clue (such as 209.185.243.135). The role of DNS is to avoid the pain of remembering numbers for us to translate between text and IP.

If your phone has a name memory function, you only need to know the other person's name to dial the friend. We can say that this phone also has the function of DNS, but the DNS system we use in the network. Is it so simple? It’s not too complicated. Let’s explore the mystery of DNS together.

In the early days of the IP network, every computer only used IP addresses to indicate that people soon discovered This is hard to remember. Some UNIX users create a HOSTS correspondence table that associates the IP with the host name so that the user can enter the computer name instead of IP to communicate. If you have a Linux system installed in /etc you can find the hosts file. In the NT system you can also find it under \\winnt\\system32\\drivers\\etc. However, the biggest problem with this HOSTS file being manually maintained by the administrator is that it cannot be applied to large networks and updates are a real headache. This is the time for the DNS to come in handy.