DNS即域名系统，当访问一个域名时，系统会问DNS服务器这个域名对应的IP地址是什么，而后才根据IP地址来访问对应的服务器，因此使用一个合适的DNS服务器不仅可以提高访问速度，也可以避免DNS劫持。如移不动公司的宽带提供的域名解析服务器常有DNS劫持的情况发生，例如在网页边角添加弹出式广告、域名无法解析时跳转到广告页面等。
1.单击DNS测试按钮，程序自动获取列表中所有DNS服务器与本机的延迟，测试结束后按延迟从小到大进行排序
![图片[1] - DNS优选工具 (挑选最合适的DNS服务器) - 宅自学](https://www.zhaizixue.com/wp-content/uploads/2020/08/20200813070525499.png)
2.右键单击需要设置的DNS项目，弹出设置菜单
![图片[2] - DNS优选工具 (挑选最合适的DNS服务器) - 宅自学](https://www.zhaizixue.com/wp-content/uploads/2020/08/20200813070636568.png)
3.如没有给予管理员权限会弹出提示，可自动重启并获取管理员权限
4.单击“更新DNS列表”自动从服务器获取最新的服务器列表
温馨提示：当前在用哪个网络连接，就选择哪一项
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