The server rental has been very mature, and all major dealers have shown their advantages. Due to fierce competition, the service leasing industry faces more challenges. Domain name refers to the name of a computer or computer group on the Internet, which is used to identify the electronic location (sometimes geographical location) of a computer during data transmission. The domain name consists of a string of names separated by dots, usually including the name of the organization, and always contains a two or three letter suffix to indicate the type of organization or the country or region where the domain is located. The use of servers can not be separated from the company. There are many kinds of domain names of servers, including: the main domain name server is responsible for maintaining all domain name information in a region, is the authoritative source of all specific information, and data can be modified. When the primary domain name server fails, shuts down, or is overloaded, the secondary domain name server provides the domain name resolution service as a backup of the primary domain name server. The data in the zone file of the secondary domain name server is copied from another primary domain name server and cannot be modified. The cached domain name server obtains the query answer of each domain name server from a remote server. Once the answer is obtained, it will be put into the cache, and the data in the cache will be used to answer the same information later. The cache domain name server is not an authoritative domain name server because it provides indirect information. Domain name server is very important for our use in the network. I hope Bian Xiao's introduction can help you.