Home > Data Protection > PowerProtect Cyber Recovery > Dell PowerProtect Cyber Recovery: Reference Architecture > Recommended connections between DD series
The Cyber Recovery software works with a replication data link between the vault-environment and production-environment DD series. The Cyber Recovery software communicates with all DD series appliances using SSH.
The production and vault environment networks are not directly connected to each other, except for a replication data link between the DD series in the two environments. The replication data link can be connected directly or through a dedicated switch to the DD series in the vault environment. We recommend using the dedicated replication switches.