ELI5: What is Virtual Network Security?
Just like physical networks need switches and firewalls, virtual networks need virtual versions of those same tools. Virtual network security means protecting the invisible connections between virtual computers using software-based guards and barriers.
Definition
Virtual network security encompasses the controls and mechanisms used to protect network traffic within virtualized environments. This includes virtual switches (vSwitches), virtual firewalls, and micro-segmentation techniques that enforce security policies between virtual machines running on the same physical host. Unlike traditional network security that relies on physical devices, virtual network security operates at the hypervisor level to inspect and control east-west traffic.
Key Details
- Virtual switches (vSwitches) connect VMs within a host and can enforce VLAN tagging, port security, and traffic isolation
- Virtual firewalls inspect traffic between VMs on the same host — traffic that never crosses a physical network device
- Micro-segmentation applies granular security policies to individual workloads, limiting lateral movement after a breach
- East-west traffic (VM-to-VM within the data center) often exceeds north-south traffic and requires dedicated virtual security controls
- Software-defined networking (SDN) enables centralized policy management across virtual network infrastructure
Connections
- Parent: virtualization-security — core virtualization security control
- See also: vm-isolation, vlans-virtual-lans