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：2025-01-20 14:41:40
什么是DNS DDoS攻击？DNS DDoS攻击的后果非常严重，小到导致单个用户或小型网络无法访问互联网，大到可能使整个网站、地区甚至国家范围内的互联网服务瘫痪。例如，2016年美国“黑色星期五”期间，由于美国主要DNS服务商Dyn遭遇大规模DDoS攻击，导致大半个美国“断网”。部署高性能防火墙：高性能防火墙能够识别和.........【阅读全文】
发布时间：2025-01-17 15:02:16
什么是TTL值？TTL值有什么用？影响解析速度：TTL值较小时，客户端需要频繁查询权威服务器，增加解析时间；TTL值较大时，客户端可以从缓存中快速获取记录，减少解析时间。怎么合理设置TTL值？参考默认值：对于大部分解析服务商来说，TTL值通常都有一个默认值，这个默认值一般都能满足大部分企业的需求。因.........【阅读全文】
发布时间：2025-01-16 14:14:43
什么是DNS缓存？基于此，DNS系统中引入了缓存机制。DNS服务器会将已经查询过的域名解析结果（即域名对应的IP地址）存储在本地的一段时间。这种机制允许在后续的查询中，直接从本地缓存中获取结果，而无需再次向上游DNS服务器发起请求，大幅提升了解析速度。DNS缓存的工作原理相对简单。当用户在浏览器中输入一个.........【阅读全文】
发布时间：2025-01-15 11:14:33
DNS故障产生原因有哪些？DNS记录配置错误：如果A记录和AAAA记录配置错误，域名无法解析到正确的IP地址。CNAME记录用于将域名别名指向另一个域名，如果配置错误，也可能导致解析失败。修改解析记录：当修改DNS记录后，全球DNS服务器需要一定时间（通常几小时到48小时）同步更新。在此期间，部分用户可能无法访问网.........【阅读全文】
JVDLFFLR2025-08-03 17:15
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17194450143l2025-06-06 07:45
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