The root domain of the Adatum forest is Adatum.local. The contoso.com domain tree is part of the
Adatum forest.
Don has an account in the australia.contoso.com domain and is signing on to a computer that is a
member of the computers.adatum.local domain.
No additional UPNs have been configured.
Which UPN suffix will Don use to sign on to this computer?
A.
@adatum.com
B.
@adatum.local
C.
@computers.adatum.local
D.
@australia.contoso.com
D*
*not 100% sure.
https://technet.microsoft.com/en-us/library/cc783351(v=ws.10).aspx
“The three parts of a UPN are the UPN prefix (user logon name), the @ character, and the UPN suffix (usually a domain name). The default UPN suffix for a user account is the DNS name of the Active Directory domain where the user account is located. For example, the UPN for user Frank Miller, who has a user account in the Wingtiptoys.com domain (if Wingtiptoys.com is the only domain in the tree), is FMiller@Wingtiptoys.com. ”
No additional UPNs have been configured so he will have to use the “unwieldy” don@australia.contoso.com .
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I believe D
There is no additional UPN configured so he has to use his “native” UPN.
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D. @australia.contoso.com
I labbed it, created a DC in its own child domain, created a test user on it and the default UPN was childomain.rootdomain.com. ADUC would have let me change the UPN to rootdomain.com, there was a drop down with these 2 options, but I left it.
Then I went to a server in rootdomain.com and logged on as MyTestUser@childomain.rootdomain.com
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From Exam Ref. 70-412 p.272
User principal name (UPN) suffixes
“User principal name (UPN) suffixes are the part of a user’s UPN that trails the @ symbol.
For example, in the UPN don_funk@contoso.com, the UPN suffix is the domain name contoso.com. UPN suffixes enable users to sign on using an account name that includes the name of their domains. Because UPN suffixes look like email addresses, users find them easy to remember. This is useful in complex environments where users might be logging on to computers that are members of domains that are different from the domains that host their accounts.
For example, Kim Aker’s user account might be located in the accounts.contoso.com domain, but she needs to sign on to a computer that is a member of the computers.contoso.com domain. Rather than having to sign on as accounts\kim_akers as her user name, or selecting the accounts domain from a list, she can instead sign on using the UPN of kim_akers@contoso.com.
By DEFAULT, all users use the UPN suffix that is the name of the forest root domain, even if their accounts are in a child domain. You configure UPN suffixes using the Active Directory Domains And Trusts console as shown in Figure 1-4.”
https://www.microsoftpressstore.com/articles/article.aspx?p=2217267&seqNum=2
Wouldn’t that mean that mean that without additional UPN configuration, Don will be able to sign with @adatum.local (B), as this is a forest root domain UPN?
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Answer: D
As Aberdeen Angus stated, this can be verified in a lab.
Cuser1 ID created with default settings in child.contoso.com can logon to contoso.com server as cuser1@child.contoso.com, but can not login as cuser1@contoso.com.
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from the book (Objective review 276):
4. The root domain of the Adatum forest is Adatum.local. The contoso.com domain tree is part of the Adatum forest. Don has an account in the australia.contoso.com domain and is signing on to a computer that is a member of the computers.adatum.local domain.
No additional UPNs have been configured. Which UPN suffix will Don use to sign on to this computer?
A. @adatum.com
B. @adatum.local
C. @computers.adatum.local
D. @australia.contoso.com
Correct Answer: B
A. Incorrect: The default UPN suffix for a forest is the forest root domain. Because the forest root domain is Adatum.local, this will be the default UPN suffix.
B. Correct: The default UPN suffix for a forest is the forest root domain. Because the forest root domain is Adatum.local, this will be the default UPN suffix.
C. Incorrect: The default UPN suffix for a forest is the forest root domain. Because the forest root domain is Adatum.local, this will be the default UPN suffix.
D. Incorrect: The default UPN suffix for a forest is the forest root domain. Because the forest root domain is Adatum.local, this will be the default UPN suffix.
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