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DNS是网络中非常重要的Internet服务。它的主要作用是提供IP地址和域名地址的转换,提供两种查询服务:正向查询将名称解析成IP地址,反向查询则将IP地址解析成名称。域名只是便于记忆的地址信息,真正访问某服务器时,仍需将域名转换为IP地址。随着Internet互联网的普及,作为互联网上唯一可识别的地址——IP地址来说,其形式难于记忆,不利于访问,在实际应用中,人们往往通过DNS服务器把不便于记忆的IP地址转换为形如www.google.com这样的便于理解和记忆的助记符地址的形式,从而使网络互访变得轻松起来,这种助记符就被人们称为域名。
DNS is a very important Internet service in the network. Its main function is to provide the conversion of IP address and domain name address, providing two kinds of inquiry services: forward query resolves name into IP address, reverse query resolves IP address into name. Domain name is just easy to remember address information, the real visit to a server, you still need to convert the domain name to IP address. With the popularization of the Internet, as the only identifiable IP address on the Internet, its form is difficult to memorize and is not conducive to access. In practical applications, people often translate inconvenient IP addresses into Forms such as www.google.com, an easy-to-understand and memorable mnemonic address, make it easier to communicate with each other on the web, a mnemonic that people call the domain name.