This June 2009 white paper was jointly written by Cisco and VMware. It elaborates on virtualized DMZs (the concept that was called "Fully Collapsed DMZ" in VMware's earlier white paper DMZ Virtualization with VMware Infrastructure) in much more detail and with a focus son the Cisco Nexus !00V virtual switch. Interestingly, it doe snot mention VMware's own vShield Zones technology, indicating some duplication of effort/divergence in research after VMware's purchase of some BlueLane assets. All in all, a worth-whilw and more sophisticated take on DMZs than the earlier white paper, which, however, remains valid as it also discusses other models of separation.