Which VM/Host rule ensures domain controllers run on separate ESXi hosts?

The rule that ensures domain controllers run on separate ESXi hosts is the one that is focused on separating specific virtual machines. This rule is designed to enhance availability and prevent single points of failure in a virtualized environment.

When domain controllers are placed on separate hosts, it helps mitigate the risk of them being affected by a failure or outage on a single ESXi host. If both domain controllers reside on the same host and that host experiences issues, both domain controllers would become unavailable, potentially leading to significant disruptions for the network.

By implementing the separate virtual machine rule, you ensure that critical services, like domain management provided by domain controllers, maintain their availability and resiliency. This practice is a key aspect of maintaining a robust and highly available virtual infrastructure, particularly in environments where Active Directory plays a critical role in managing authentication and authorization services.