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VMware NSX is a virtual networking and security software product family created from VMware's vCloud Networking and Security (vCNS) and Nicira Network Virtualization Platform (NVP) intellectual property.
NSX software-defined networking is part of VMware's software-defined data center concept, which offers cloud computing on VMware virtualization technologies. VMware's stated goal with NSX is to provision virtual networking environments without command line interfaces or other direct administrator intervention. Network virtualization abstracts network operations from the underlying hardware onto a distributed virtualization layer, much like server virtualization does for processing power and operating systems. VMware vCNS (formerly called vShield) virtualizes L4-L7 of the network. Nicira's NVP virtualizes the network fabric, L2 and L3.
VMware says that NSX will expose logical firewalls, switches, routers, ports and other networking elements to allow virtual networking among vendor-agnostic hypervisors, cloud management systems and associated network hardware. It also will support external networking and security ecosystem services.