Techniques are described for configuration and application of intent-based network access control (NAC) policies for authentication and authorization of multi-tenant, network access server (NAS) devices to access enterprise networks of organizations. A network management system configures intent-based NAC policies for an organization. A cloud-based NAC system may apply an appropriate intent-based NAC policy in response to an authentication request from a NAS device. The NAC system identifies a vendor of the NAS device, matches incoming attributes in the authentication request to a set of normalized match rules of the intent-based NAC policy, and translates a set of abstracted policy results corresponding to the set of normalized match rules into a vendor-specific set of return attributes based on the vendor of the NAS device. The NAC system sends the vendor-specific set of return attributes to the NAS device to enable the NAS device to access the enterprise network of the organization.