With URA, NAP can be used to check the health of connecting clients and block them if they are not healthy. The NAP services and client are separate from URA, and so you need to design and build your NAP infrastructure independently. Unfortunately, you cannot configure the URA server itself to be your NAP server.
Once you enable NAP integration with URA, the URA server will work with your Health Registration Authority (HRA) and Health Policy Server (HPS). The NAP agent on your clients will generate a Statement of Health (SOH) and send it to the URA server. The URA server, before granting full access, will send the SOH to its designated HRA, which will work with the HPS to validate the status. Only if the HPS confirms that the client meets the requirements, will it let the client into the network. If the client doesn't meet the requirements, the HPS will tell URA that this client's a persona non-grata right now, and if you have configured it for remediation, will offer information...