To enable security orchestration in a software-defined network (SDN), the Palo Alto Networks platform architecture relies on specific elements. A full set of APIs allows for programmatic control of policy and configuration, which is essential for integrating and automating security measures within an SDN environment. Additionally, Dynamic Address Groups enable security policies to be adapted dynamically, responding to changes in the network and ensuring that policies remain effective as the network evolves. These two elements together facilitate comprehensive and flexible security orchestration within an SDN.