Traditional approaches to network security simply do not work well in virtualized environments. Security services are delivered to VM-based applications through a specialized “security virtual machine” Some analysts are warning vSphere carries risk. But anyone adopting vShield, whether service provider or enterprise, “should do it with eyes wide open” Cisco has taken steps to design products specifically for vSphere, including the Virtual Security Gateway for Cisco Nexus 1000V Series Switches, to provide trusted access, firewalling, filtering and security policies.”]
Source: https://www.csoonline.com/article/2128607/battle-looms-over-securing-virtualized-systems.html