Absolute (Fully Qualified) and Relative (Partially Qualified) Domain Name Specifications
As explained in the previous section, we can specify the domain name of any node in the DNS name hierarchy by simply starting at the root node and following the sequence of subdomains down to the node in question, listing each level's labels separated by a dot. When we do this, we get a single name that uniquely identifies a particular device. In practice, domain names can be specified by their fully qualified names or their partially qualified names.
Fully Qualified Domain Names
Technically, if a top-level domain A contains a subdomain B that contains subdomain C, the full domain name for C is C.B.A.. This is called the fully qualified domain name (FQDN) for ...
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