It worked on principle of Network Access Control (NAC) aims to do exactly what the name implies: control access to a network with policies, including pre-admission endpoint security policy checks and post-admission controls over where users and devices can go on a network and what they can do.
"NAC's roots trace back to the trusted computing movement. In this context an open-architecture was created as an alternative to proprietary NAC initiatives. TNC-WG aims at enabling network operators to provide endpoint integrity at every network connection, thus enabling interoperability among multi-vendor network endpoints.
Initially 802.1x was also thought of as NAC. Some still considers 802.1x as the most simple form of NAC, but most people think of NAC as something more.
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 aims to do exactly what the name implies: control access to a network with policies, including pre-admission endpoint security policy checks and post-admission controls .){kind=link}