After altering the replication topology manually by creating connection objects, what is the next step?

After manually altering the replication topology by creating connection objects, running the Knowledge Consistency Checker (KCC) algorithm is vital. The KCC is responsible for ensuring that the Active Directory replication topology is optimal. It automatically calculates the most efficient way for domain controllers to replicate information with each other. By running the KCC after making changes to the replication topology, you can verify that the configuration is correct and that replication will occur smoothly without any inconsistencies.

The other options, though important in their contexts, do not directly follow the change in replication topology. Rebooting domain controllers is typically unnecessary unless specified by other operational requirements or issues. Notifying users of the changes does not directly impact the replication process, and while documentation is crucial for future reference, it is not a step taken immediately after altering the topology; rather, it is a good practice to follow the technical adjustments.