NSX data plane is NSX vSwitch. NSX vSwitch is based on the vDS with NSX kernel modules; userspace agent is packaged in VIB and run hypervisor kernel. It provides services as a logical firewall, routing, and switching (VXLAN):

[root@esxdell1:~] vmkload_mod -l | grep nsx
nsx-dvfilter-switch-security9 128
nsx-traceflow 3 20
nsx-bfd 1 28
nsx-core 2 12
nsx-vdl2 7 416
nsx-vdrb 1 340
nsx-vsip 21 652