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A: VMware vShield is a collection of virtual appliances built for the VMware vSphere platform. Its virtual appliances provide security services for vSphere VMs, supporting activities such as firewall protection and anti-malware.
A network standard switch, virtual switch, or vSwitch, is responsible for connecting virtual machines to a virtual network. A vSwitch works similar to a physical switch -- with some limitations -- and controls how virtual machines communicate with one another.