Which of the following is NOT a policy sync state?

The correct answer identifies 'Down' as not being a policy sync state within the framework of Illumio’s operational parameters. In the context of policy synchronization, the other states—Active, Active (syncing), and Staged—represent various stages of synchronization and deployment of policies across endpoints.

'Active' indicates that the policy has been successfully deployed and is actively enforced on the endpoints. 'Active (syncing)' communicates that the policy is currently in the process of being synchronized with the endpoints but hasn’t completed that process yet. 'Staged' refers to policies that are prepared to be deployed but have not been applied yet.

In contrast, 'Down' does not fit into these synchronization categories. It typically suggests an endpoint is not reachable or is experiencing connectivity issues rather than a state of policy synchronization. This understanding of the different states helps clarify how policies are managed and enforced in Illumio's environment.