每次网络发生问题时,系统维护员总会说:“专线断了或DNS服务器断掉了”,到底什么是DNS服务器?为什么它一掉线我们就不能上网了呢?下面我向众位一一说来, DNS全名叫Domain Name Server(主域名服务器),在说明DNS Server前,可能要先说明什么叫Domain Name,在网络上辨别一台电脑的方式是利用IP,但是一组IP数字就像电话号码很不容易记,且没有什么可供人们联想的意义。因此,我们会为网络上的伺服器取一个有意义又容易记的名字,这个名字我们就叫它——Domain Every time a problem occurs on the network, the system maintainer always says: “The dedicated line is broken or the DNS server is broken.” What is a DNS server in the end? Why can not we access the internet when it is dropped? In a nutshell, the DNS full name is Domain Name Server. Before describing the DNS Server, you may want to describe what Domain Name means to identify a computer on the network by using IP. However, a set of IP numbers Just as phone numbers are not easy to remember, and there is nothing that people can associate with. Therefore, we will take a meaningful and easy-to-remember name for the server on the network, which we call it Domain