Data policy operates on the data plane in the Cisco SD-WAN overlay network and affects how data traffic is sent among Cisco SD-WAN devices in the network. The Cisco SD-WAN architecture defines two types of data policy, centralized data policy, which controls the flow of data traffic based on the IP header fields in the data packets and based on network segmentation, and localized data policy, which controls the flow of data traffic into and out of interfaces and interface queues on the devices. Reference: https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network- automation-and-management/dna- center/tech_notes/sda_fabric_troubleshooting/b_cisco_sda_fabric_troubleshooting_guide.html