Active Directory Domain Name Length. Fully qualified domain name length. First of all both usernames are simply attributes of the users account and they have the following names in the Active Directory database.
SAMAccountName Its important to note that when a local AD user signs into their workstation by using their sAMAccountName the domain portion is a single label akin to a NetBIOS name. AD Domain names are mainly used within AD operations mostly LDAP queries for AD functionality while DNS is rather a network level solution for name resolution on IP level to resolve the machines or application names to IP addresses. NT AUTHORITY Logon ID.
ANONYMOUS LOGON Account Domain.
The size of the samAccountName value for a user should not exceed 20 characters due to backward compatibility for a computer object the maximum size of samAccountName is 16 characters. The user logon name pre-2000 label is obviously confusing things here. MacOS wont be able to join an Active Directory domain without a domain functional level of at least Windows Server 2008 unless you explicitly enable weak cryptoEven if the domain functional levels of all domains are 2008 or later the administrator may need to explicitly specify each domain trust to use Kerberos AES encryption. ANONYMOUS LOGON Account Name.