Network Virtualization or Software Defined Networking (SDN) is an overlay based approach that helps a network administrator in an enterprise datacenter to program and provision the network on-demand and without having physical access to the switches or routers. SDN allows a network to be provisioned in a matter of seconds, as opposed to days or weeks it takes today. There are numerous benefits of network virtualization in an enterprise datacenter listed below:

Benefits
  • Easy & Cheaper Manageability
  • Reduce Time to Provision
  • Avoids Limitations on Current Networking Topology
  • Allows Policy Based Access
  • Easier Troubleshooting
  • Stepping Stone for Building a Fully Automated Cloud Environment