The DNSDomainSuffixSearchOrder parameter specifies the DNS domain suffixes that is appended to the host names during name ...

The DNSDomainSuffixSearchOrder parameter specifies the DNS domain suffixes that is appended to the host names during name resolution. When attempting to resolve a fully qualified domain name (FQDN) from a host only name, the system appends the local domain name. If this is not successful, the system uses the domain suffix list to create additional FQDNs in the order listed, and queries DNS servers for each one.