To isolate storage traffic from other network traffic, a best practices is to use either dedicated switches and physical NICs for your NFS, but if you don't have enough physical network resources to dedicated to NFS, you may can share the same physical network, including physical NICs, but make sure you at least isolate NFS traffic using VLANs and since you are using distributed switches you may also can consider enable Network I/O Control (NIOC).
You can check some additional best practices in the following link: https://storagehub.vmware.com/export_to_pdf/best-practices-for-running-vmware-vsphere-on-network-att...