1. I'm not sure I understand what you mean by communicate. When SSSD is first started, it will sync all of the users and groups in AD to the local node, so any existing users will be able to log in, and have the correct groups ready for them (assuming configuration is set up properly). 2. Rolling back SSSD is possible but troublesome. It would consist of stopping the service and uninstalling it from the node. I'm not sure if the users and groups would still be on the node, but you would need to uninstall that as well. There may be some other pieces left around, but none that I would expect to cause any differences, unless you were to try to install SSSD again.
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