FQDN（完全限定域名）
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FQDN（完全限定域名）是指定其在[[dns|DNS]]层次结构中从主机到顶级域名的精确位置的完整域名。它包含所有标签，并以代表DNS根的尾随点结束。
示例
The FQDN 'www.example.com.' (note the trailing dot) uniquely identifies a specific host in the DNS hierarchy.