How do you handle a replication failure in Active Directory across two sites? 2. What tools and steps do you use to troubleshoot GPOs not applying to a group of users? 3. Explain how Windows Failover Clustering works. How would you design a 2-node cluster? 4. What are the key FSMO roles, and what happens if one is unavailable? 5. How do you perform AD health checks proactively?