为什么我被告知网址 xxx.yyy.com 中的 xxx 不是子域？
编辑：比我在示例中给出的地址更多。有子文件夹吗？？ https://some_external_website.com/bh/public
说 xxx 是否正确yyy.com 的子域，写为 xxx.yyy.com
我发送给 BIG IT 部门的电子邮件：名称已更改，以保护无辜者
其他信息：请创建一个条目，将子域 xxx.yyy.com 映射到 https://some_external_website.com/bh /公共 这是一个外部托管的 Web 应用程序。如果您有任何疑问，请给我打电话。
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大约一个小时后，我接到一个电话，因为他们不知道我想要什么，我被告知 xxx 不是子域。正确的定义子域必须是 xxx.www.yyy.com。
edit: more to the address than I had given in the example. It has a subfolder?? https://some_external_website.com/bh/public
Is it correct to say that xxx is a subdomain of yyy.com written as xxx.yyy.com
email I sent to the BIG IT dept: names changed to protect the innocent
Additional Info:Please create an entry that will map the subdomain xxx.yyy.com to https://some_external_website.com/bh/public
this is an externally hosted web application. Please call me if you have any questions.
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About an hour later I get a call because they don't know what I want, I was told that xxx is not a subdomain. The correct definition subdomain it would have to be xxx.www.yyy.com.
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“域名”的第一个组成部分始终是主机名。我们可以将域名视为由主机名后跟一个或多个域组件组成。每个域组件都是其紧邻的组件的子域。在 xxx.yyy.zzz 中，xxx 是主机名（通常是单台机器的主机名，除非正在进行某种负载平衡），yyy 是 zzz 顶级域的子域。通俗地说，我们通常将 zzz 称为顶级域名，yyy 称为“域”，而左侧的所有其他名称（不包括最左边的主机名）称为子域。我将添加免责声明，即我绝不是 DNS 专家，但据我所知，这就是他们不理解您的问题的原因。主机名本身并不是一个“域”，即它定义的是一台机器而不是一组机器（域）。
The first component of a "domain name" is always the hostname. We can view a domain name as consisting of a hostname followed by one or more domain components. Each domain component is a subdomain of the component to it's immediate right. In xxx.yyy.zzz, xxx is the hostname (typically of a single machine, unless some kind of load balancing is going on), and yyy is a sub-domain of the zzz top-level domain. Colloquially we usually refer to zzz as the top-level domian, yyy as "the domain", and all other names to the left (excluding leftmost which is the hostname) as sub-domains. I'll add the disclaimer that I am by no means a DNS expert but to the best of my knowledge this would be why they aren't understanding your question. The hostname is not a "domain" per-se, i.e. it defines a single machine rather than a group (domain) of machines.