Moving FSMO roles

In the Active Directory infrastructure, on certain occasions, FSMO roles will need to be moved from one domain controller to another. Here, I have listed a few scenarios where it will be necessary to consider FSMO roles transfers:

• Active Directory upgrades: When the infrastructure needs to be upgraded from one Active Directory version to another, first we need to introduce the new domain controllers to the existing infrastructure and then move the FSMO roles. After that, the domain controllers that run older versions can decommissioned, and then we can increase the forest and domain functional levels to the latest (Windows server 2016).
• Active Directory logical and physical topology: When installing the first domain controller in the infrastructure, it will automatically hold all five FSMO roles. But, based on the Active Directory topology design, the roles...