Youwant to configure a security relationship by which users in the Melbourne domain of the
Adatum.com forest are able to access resources in the Sydney domain of the Contoso forest. Users
do not require access to resources in any other domains in either forest.
Which of the following should you configure to accomplish this goal?
A.
Configure a forest trust
B.
Configure an external trust
C.
Create a shortcut trust.
D.
Configure name suffix routing.
https://technet.microsoft.com/en-us/library/cc732859(v=ws.11).aspx
External trusts are sometimes necessary when users need access to resources in a Windows NT 4.0 domain or in a domain that is located in a separate forest that is not joined by a forest trust,
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Answer: B
In additions to the explanation listed by LWG, an external trust can be created within the same forest. The child domain must trust the parent domain, but the parent domain does not have to trust the child domain (aka it can be removed after the child domain is created).
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