国科云提供域名管理、域名锁、智能解析、DDI、IPv6转换、SSL证书等一站式域名解决方案，并形成以云解析、云监控、云盾、云服务器为核心的云计算产品服务体系。
发布时间：2021-12-23 17:54:28
正常的DNS查询过程并不是每次都委托递归解析服务器发起全球查询，而是会将获取的解析记录缓存到浏览器和操作系统中。一旦再次对这个域名进行访问，则直接读取浏览器或操作系统缓存中的记录，进行快速访问，而无需再次进行全球递归查询，大大节省了查询时间。但是这样带来的问题是，如果该域名的解析记录发生变.........【阅读全文】
发布时间：2021-12-22 14:32:45
如果域名状态出现异常，权威DNS服务器是无法接收到DNS查询请求并完成相应任务的。当域名处于clienthold、serverhold、inactive三种状态，则表明当前域名状态处于异常，此时需要联系域名服务商查明原因，并及时恢复正常。如果网络连接异常，也会出现DNS解析故障。所以在查明域名状态后，我们可以通过ping工.........【阅读全文】
发布时间：2021-12-21 14:38:40
如果本机缓存中没有解析记录，就会委托递归解析服务器向根域名服务器、顶级域名服务器、权威域名服务器等一级级发起递归查询，直到获得相应的结果。（1）通过“开始->运行->输入CMD”进入命令行模式。DNS缓存清理完毕后，再次访问域名，就会委托递归解析服务器发起全球递归查询，从而获得.........【阅读全文】
发布时间：2021-12-16 15:00:14
1.通过nslookup命令来判断DNS解析是否出现故障（1）通过“开始->运行->输入CMD”操作，进入命令行模式。（4）如果DNS服务器显示的是公司内部网络地址，说明DNS解析工作是交由公司内部的DNS服务器来完成的，这时我们需要检查这个DNS服务器是否出现故障，在DNS服务器.........【阅读全文】
发布时间：2021-12-15 15:21:09
互联网采用了层次树状结构的命名方法。任何一个连接在互联网上的主机或路由器，都有一个唯一的层次结构的名字，即域名。我们观察一个域名，比如www.sfn.cn这个域名，会发现它被两个点号分割成了三个部分。其中cn为顶级域名，sfn为二级域名，www为三级域名。在图中每一个域名服务器都能进行部分域名到IP地址的解析.........【阅读全文】
JVDLFFLR2025-08-03 17:15
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