我换成旗舰版后，应该我的dns服务器改成了旗舰版了。如果有的地方缓存我的域名服务器还是免费版的，但是自己nslookup 指定免费版的能够生效。是不是说明不用等48小时了。阿里云内部做了优化，当升级旗舰版dns后，增删改解析时会同步更新免费版和旗舰版的解析值？从我自己nslookup来看是的。所以想确认下。

文章 2023-07-20 来自：开发者社区

最近在准备秋招，在面试一些比较大的互联网场的时候，感觉面试官更注重一些算法和计算机基础，上次就被问到了一个 DNS 解析过程的问题，我只知道它是一个域名解析系统，负责把域名解析成 IP，很显然这个答案并不能让面试官满意，所以自己查阅资料并研究了一下，感觉这篇博文写的比较好，在这里搬过来并做一些修改，推荐给大家：传送门。1、DNS 是个啥?DNS(Domain Name System) 域名系统，....

问答 2023-07-19 来自：开发者社区

因为更换dns服务器，完全生效需要48小时为保持解析记录一致，需要等待48小时才能修改解析记录吗？

因为更换dns服务器，完全生效需要48小时。把阿里云的免费版dns服务器升级为旗舰版的dns服务器，为保持解析记录一致，需要等待48小时才能修改解析记录吗？

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