粘合记录
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粘合记录是存储在上级区域（如 .com）中的特殊 [[a-record|A 记录]] 或 [[aaaa-record|AAAA 记录]]，提供位于同一域名下 [[nameserver|权威域名服务器]] 的 IP 地址，从而防止 DNS 循环依赖。
示例
If ns1.example.com is a nameserver for example.com, the .com zone needs a glue record mapping ns1.example.com to an IP address.