正解:A,D
In Cisco SD-Access, the network data platform (NDP) and the network control platform (NCP) are two components that facilitate communication between traditional network elements and the controller layer. The NDP collects data, identifies trends, and analyzes network events, providing operational status and other relevant information to the management layer. The NCP provides automation and orchestration services for the fabric and underlay network, managing network devices and providing automation information to the management layer. These platforms ensure that traditional network elements can integrate and communicate effectively with the controller layer, which is essential for the operation of a software-defined network.