dns是什么
时间：2024-09-27
编辑：tance.cc
dns是什么
DNS是域名系统（Domain Name System）的缩写，它是互联网上一个重要的服务系统，主要负责将域名和IP地址相互映射，使人更容易访问互联网。DNS使用TCP和UDP协议的53号端口进行通信。
当你在浏览器地址栏输入一个网址（如 www.example.com）时，你的计算机会向DNS服务器查询这个域名对应的IP地址。DNS服务器会返回相应的IP地址（如 93.184.216.34），然后你的计算机会使用这个IP地址去访问目标网站。
DNS的主要功能包括：
一、域名解析：将人类易于记忆的域名转换为机器使用的IP地址。
二、负载均衡：在多个服务器之间分配网络流量。
三、故障转移：当一个服务器不可用时，DNS可以指导用户访问备用服务器。
四、缓存：DNS服务器通常会缓存域名解析结果，以加快响应速度并减少网络流量。
DNS查询通常包括以下步骤：
递归查询：用户向本地DNS服务器发起查询，如果本地服务器不知道答案，它会向其他DNS服务器查询，直到找到答案并返回给用户。
迭代查询：当一个DNS服务器不知道答案时，它会将用户引导至另一个DNS服务器，用户自己继续查询过程。
DNS是互联网基础设施的关键组成部分，没有它，我们就需要记住和输入复杂的数字IP地址来访问网站。
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