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Read replication results and identify the five FSMO roles while keeping routine transfer separate from disaster recovery seizure.

Promote a fresh DC2 into the existing domain, verify replication and DNS on both controllers, and plan client changes after validation.

Build isolated lab OUs, create a standard user and security group, and verify object locations, membership, and sign-in.

Prepare internal DNS and join permissions, verify domain membership and the current session, and handle account reuse and departure safely.

Promote DC1 into a new lab forest, verify DNS and SYSVOL, and reconcile any existing DHCP setup with domain authorization.

Understand directory services, distinguish object location from group membership, and plan DNS, controllers, and account protection.

Separate addressing, routing, name resolution, and service tests, then change one setting and repeat the original failure.

Convert a verified client lease to a reservation, compare option scopes, and confirm the settings actually received after renewal.

Deploy a controlled DHCP lab, check domain authorization where applicable, and verify real leases before treating the scope as operational.

Keep clients on internal DNS while planning an approved upstream path, and distinguish forwarding failures from zone and cache problems.