Which condition must be present to support DRE in a Cisco SD-WAN environment?

DRE can be applied to various traffic patterns, not exclusively client-server topologies; it works on any traffic that exhibits redundancy.

TCP optimization is a separate feature that can improve TCP performance, but it is not a prerequisite for DRE; DRE focuses on data compression and de-duplication.

While DRE can be deployed in hub-and-spoke topologies, it is not a required condition for DRE support; DRE can also function in full-mesh or other topologies as long as flow symmetry is maintained.

Data Redundancy Elimination (DRE) relies on seeing both directions of a traffic flow to effectively identify and eliminate redundant data patterns. Flow symmetry, where both forward and reverse packets of a connection take the same path, is therefore essential for DRE to function correctly and maximize its efficiency.