DNS伝播
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DNS伝播とは、DNSレコードの変更が世界中のすべての[[dns-resolver|再帰リゾルバ]]に広まるまでにかかる時間です。伝播時間は以前の[[ttl|TTL]]値によって異なり、数分から最大48時間かかることがあります。
使用例
After updating your nameservers, some visitors might still see the old site for up to 48 hours until all cached records expire.