Do I have a disjointed Domain

My domian FQDN is domain.domaindumb.com, my NetBios Domain is domain. Do I have a disjointed Domain?

The link below says "NetBIOS name of domain controller differs from subdomain of its DNS domain name   The NetBIOS domain name of the domain controller isn't the same as the subdomain of the DNS domain name of that domain controller."

Disjoint namespace scenarios

https://technet.microsoft.com/en-us/library/bb676377%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396#View

HOSTNAME is name of the DC