Possible on-premise scenarios

When designing a ConfigMgr deployment, we may choose between a few server types, and we also have the ability to combine these few servers together.

An important thing to keep in mind is that there is, in fact, the possibility of changing the environment after the deployment. The administrator might start with one server, and have a few of them at the end, or the other way--the number of servers might go down. 

ConfigMgr is a scalable solution, so it can be changed and might grow together with the organization.