Thank you so much for posting here.
As per my understanding and tests, if we run "netdom computername currentname /Add: secondname.domain.com" command, it will add an alternate name for the domain controller or member server.
If I tried to login using alternate name, I am getting “the account or the password is not correct" error.
As mentioned in the link, "Running "netdom computername currentname /Add: secondname.domain.com" adds a second DNS entry, but does nothing for Netbios. Infact the syntax of the command states "new-alternate-dns-name""
I researched about whether we could set multiple netbios domain name to a single domain controller, but failed to get any useful information. Below is the discussion about how to rename domain netbios name.
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