• 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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  • 原文地址：https://blog.csdn.net/dexunjiaqiang/article/details/134367100