Answer: A program to save the domain name table and corresponding IP address, which is used to resolve the domain name of the mail. In the Internet era, domain name servers play an important role in domain name resolution. To understand why domain name resolution takes so long, we need to understand the process of domain name resolution and the role of DNS servers. A domain name is resolved to a server, and the web file is placed on the server, so that the user's computer can know which server to go to to obtain the web page information of the domain name. This is achieved through the domain name server. When we browse the web, many people directly visit the domain name to enter the website. Of course, there are many categories: 1. Primary Domain Name Server 2. Secondary Domain Name Server 3. Cache DNS 4. Forwarding DNS Each DNS server has its own method. I hope today's answer can help you. 24H Sales Hotline (Tel): 0371-8991308824h Technical Hotline (Tel): 0371-8991300024h Filing Hotline (Tel): 0371-89913078 Company Fax (Fax): 0371-89913095