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The DNS （ Domain Name Server ）is the Server that converts the Domain Name to its corresponding IP address.A table of domain names and their IP addresses is kept in DNS to resolve the domain names of the messages.A domain name is the name of a computer or computer unit on the Internet used to identify the computer's electronic (and sometimes geographic) location during data transmission.A domain name is a series of dotted names that usually contain the name of the organization and always include a two - or three-letter suffix to indicate the type of organization or the country or region in which the domain is located.
Overview
The software that translates a domain name into an IP address is called the domain name system, or DNS.It's a way of managing names.The approach is to divide the subsystem names into different groups.Each layer in the system is called a domain, and each domain is separated by a point.The so-called Domain Name Server is actually the host that hosts the Domain Name system.It is a hierarchical database that implements name resolution.
The Parsing Process
Every computer on the Internet is assigned an IP address, and data is actually transferred between different IP addresses.This includes computers we use at home, which are assigned an IP address when connected to the Internet, and this IP address is mostly dynamic.This means that if you turn off the modem and turn the Internet back on, your Internet access will randomly assign a new IP address.
When a visitor types a domain name into the browser's address box, or clicks a link from another web site to the domain name, the browser requests the domain name from the user's access provider, whose DNS server checks the database to see what the DNS server for the domain name is.And then go to the DNS server and grab the DNS record, which is to get which IP address the domain name points to.Once the IP information is obtained, the provider's server goes to the server corresponding to the IP address to grab the web content and transmit it to the requesting browser.
One advantage of DNS is that it can be extended on demand without affecting latency.So while the Internet is expanding daily, adding more devices, websites, and connections, the speed of parsing requests is not slowing down in any way.Another DNS advantage is that domain name resolution does not take long because access providers such as Beijing Telecom and Henan Telecom cache many DNS records in their DNS servers in order to speed up the opening of web pages.This way, when an access provider user wants to open a web page, the access provider's server does not need to query the domain name database, but directly USES the DNS records in its own cache, thus speeding up the user's access to the website.
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