DNS有什么作用 43.227.220.X

       在互联网中,其实没有类似于www.xxx.com这样的域名方式,计算机识别的是纯数字的IP地址,如555.555.555.555,比如我们知道一个网站的IP地址,直接输入访问绝对是能打开的。但现在网站成千上万,如果我们只能通过IP地址访问,这得需要我们花很大力气去记住这些繁琐和相似的数字,所以域名就作为一种更简便的寻址方式出现了。

       那为什么会有DNS呢?因为域名是给人使用的,计算机只能识别IP地址,所以需要DNS作为桥梁将域名翻译成IP地址。这样就能保证我们通过域名也能到达对应的服务器地址了。

       我们平时工作时会发现,有时候会出现能够登陆qq、微信,但是却打不开网页的情况,其中大部分原因都是DNS服务器故障造成的。因为网站需要通过DNS服务器查询解析结果,用户根据这个结果才能通过域名去访问,但是qq、微信等聊天软件,采用的是UDP传输协议,即不可靠传输协议,无需DNS服务器地址,也能登陆,所以才会出现上面的情况。

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