DNS is the abbreviation of Domain Name System, which consists of a resolver and a domain name server. A domain name server refers to a server that stores the domain names and corresponding IP addresses of all hosts in the network and has the function of converting domain names into IP addresses. The domain name must correspond to an IP address, and the IP address does not necessarily have a domain name. The domain name system adopts a hierarchical structure similar to a directory tree. The domain name server is the server side in the client/server model. It mainly comes in two forms: main server and forwarding server. The process of mapping domain names to IP addresses is called "domain name resolution". There is a one-to-one (or many-to-one) relationship between domain names and IP addresses on the Internet. Although domain names are easy for people to remember, machines can only recognize each other's IP addresses. The conversion between them is called domain name resolution. Domain names The resolution needs to be completed by a specialized domain name resolution server, and DNS is the server that performs domain name resolution. DNS naming is used in TCP/IP networks such as the Internet to find computers and services by user-friendly names. When a user enters a DNS name into an application, the DNS service can resolve the name into other information related to it, such as an IP address. Because the URL you enter when surfing the Internet is resolved by the domain name resolution system to find the corresponding IP address, so that you can access the Internet. In fact, the final point of the domain name is the IP.
DNS: Domain Name System Domain Name Management System A domain name is composed of a string of words or abbreviations separated by dots. Each domain name corresponds to a unique IP address. This naming method or the way to manage domain names The system is called a domain name management system.
The specific structure is as follows: computer name · organization name · network name · top-level domain name
The data comes from Baidu Encyclopedia and the basic tutorial of management information system of BeiKe University of Science and Technology