How does Quarantine Model overcome the limitation of a firewall?

for example,
insider attack due to a virus infection
checks the anti-virus software status periodically
unexpected communication through wireless-LAN, mobile-phone...
checks the running network interface periodically
obstacle for the deployment of IPv6
per-node security management cooperatated with network infrastructure
to summarize...
firewall
Inspection-Point and Enforcement-Point is supposed to be same
Quarantine Model
Inspection-Point and Enforcement-Point can be different