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Network Virtualization: NSX & Open vSwitch

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The network inside the hypervisor

Physical networks connect hypervisors. But inside each hypervisor, software-defined networking creates virtual networks that are entirely decoupled from the physical topology. A logical switch spans hundreds of hypervisors; firewall rules are enforced at each VM's virtual NIC, not a physical appliance.

This is how modern data centers achieve microsegmentation at scale — security policy follows workloads, not physical locations.

Packets in motion — click to inspect:

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