Network virtualization decouples services from hardware using software-defined networking (SDN) principles. Overlay networks create virtual topologies on shared physical infrastructure using protocols like VXLAN and Geneve. Network function virtualization (NFV) replaces dedicated appliances with software instances running on commercial hardware. Centralized controllers manage network state through open APIs like OpenFlow, while distributed control planes use protocols like BGP-EVPN. Service chaining automates traffic steering through virtualized security and optimization functions. Microsegmentation enables granular security policies down to individual workloads. Automation integrates with cloud orchestration platforms for instant network provisioning. Performance considerations include hypervisor bypass technologies like SR-IOV and DPDK. Monitoring virtual networks requires flow analysis tools that understand overlay encapsulations. Standardized templates (TOSCA) ensure consistent deployment across environments.





















