This NAC agent needs one-time installation on end-user device. It will do a quick device health-check scan each time the device tries to connect to the SMU networks. This process is to prevent unauthorized access and ensure those end-user devices that access the SMU’s Intranets and internal IT resources comply with a minimum level of security requirement. 

For more information please visit https://itsupport.smu.edu.sg/hc/en-us/articles/204141300-What-is-Network-Access-Control-service