This object represents the Default DNS domain name
of the system. When this object is set to a
non empty string value, the domain name part of the
fully qualified name represented by the 'sysName'
object is updated by the value of this object.
When there is no entry in the 'cdcDNSDomainNameTable',
the value of this object is used for the domain name
configuration of the system.
When there is an entry in the 'cdcDNSDomainNameTable',
the value of this object is not used.