DNS 传播
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DNS 传播是指 DNS 记录更改扩散到全球所有 [[dns-resolver|递归解析器]] 所需的时间。传播时间取决于之前的 [[ttl|TTL]] 值，可能从几分钟到 48 小时不等。
示例
After updating your nameservers, some visitors might still see the old site for up to 48 hours until all cached records expire.