Hello,
Symantec Network Access Control ensures that a company's client computers are compliant with the company's security policies before the computers are allowed to access the network. Symantec Network Access Control uses a Host Integrity Policy and an optional Symantec Enforcer to discover and evaluate which computers are compliant.
Availability: Symantec Network Access Control can be downloaded from https://fileconnect.symantec.com.
How to enable: Upgrade from CD.
Check these Articles:
How to Install Symantec Network Access Control
https://www-secure.symantec.com/connect/downloads/how-install-symantec-network-access-control
How to Install Symantec Network Access Control when SEPM is already installed and Running
https://www-secure.symantec.com/connect/articles/how-install-symantec-network-access-control-when-sepm-already-installed-and-running
Hope that helps!!