Look at the VMware network video trying to understand how the IO (hard drive of the vm or guest) connects to the NAS VM network has all the VM in it but someone told me that is for TCP/IP between machine, Vmotion got that it for migrating between hosts. Managment network seems to be for vCenter and vCenter Client to connect. So if you want to connect a NAS on 10G which port would you attach the 10G to and should you then VLAN so it does get any traffic from any thing else.
VMware network interface
You have a couple of choices. If it is a NAS, you absolutely want to use a dedicated NIC for connectivity.
The main reason is you do not want storage traffic competing with regular network traffic. The other reason, is that you will want to enable Jumbo Frames on the storage network, and not your normal LAN.
The other reason you want a dedicated NIC is that you can by hardware accelerated NICs specifically designed for iSCSI traffic. It is usually referred to as iSCSI Offload. These NICs can have a noticeable impact on the TCP/IP overhead imposed by moving SCSI traffic over IP.
All that being said, you don't want to use a network adapter for storage on production systems. The performance just isn't there. It is always better to go with Fiber Host Bus Adapters (HBAs) and connect to your SAN via fiber. When that isn't an option, NICs with iSCSI Offload combined with Jumbo Frames can get you pretty decent performance.
Hope that helps,