The probable cause of the reason why External trust or Forest trust did not appear is that DNS is not reachable.
This is known to be an Internet protocol. The Domain Name System is known to be a form of an hierarchical and decentralized king of naming system.
Note that it is often used to know computers that are said to be reachable via the use of the Internet or other Internet Protocol networks. The resource records that are found in the DNS links domain names with other kinds of information.
Hence, based on the above, The probable cause of the reason why External trust or Forest trust did not appear is that DNS is not reachable.
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If the option to select either External trust or Forest trust did not appear when configuring a forest trust, what could be the probable cause?
a. DNS is not reachable.
b. The domain controller in this domain is not restarted after setup.
c. The forest is not configured in another domain.
d. The domain controller in another domain is unresponsive.
