Network access control (NAC) and is also called network admission control, is a method of strengthen the security of a proprietary network by restricting the availability of network resources to endpoint devices that comply with a defined security policy.
So as per the NAC, the end devices are being authenticated to access the network. Hope you understand the use of the NAC- Network Access Control. While the computer is being checked by a installed software agent, it can only access resources that can remediate any issues.
Once the policy is met, the computer is able to access network resources and the Internet, within the policies defined within the NAC system. NAC is mainly used for endpoint health checks, but it is often tied to Role-based Access.
