Your network contains a single Active Directory domain.
The domain contains two Active Directory sites named Site1 and Site2.
You have a cluster named Cluster1.
Cluster1 has two nodes named Server1 and Server2.
* Server1 is located in Site1.
* Server2 is located in Site2.
* Cluster1 uses a file share witness that is located in Site1.
* Cluster1 hosts a clustered application named App1.
The network in Site1 fails.
You need to ensure that users can access App1.
What should you do?