 When a computer connects to a computer network, it is not permitted to access anything unless it complies with a business defined policy; including anti-virus protection level, system update level and configuration.While the computer is being checked by a pre-installed software agent, it can only access resources that can remediate (resolve or update) any issues.Once the policy is met, the computer is able to access network resources and the Internet, within the policies defined by the NAC system.