Access and Admission Control

Network access control (NAC) is a newer technology used to control which clients are granted access to a network. This is especially important when remote access solutions are used to allow external clients into the private network. However, NAC is also used to control infected or unhealthy clients within the network.

The overall goal of NAC is to inspect clients regularly to ensure they meet specific health requirements. Health is defined by criteria such as having up-to-date antivirus software installed and running, having a host-based firewall enabled, and keeping the operating system up to date. These elements are defined in a health policy specified by administrators. When a client is found to be unhealthy, it ...

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