Request to clarify my doubt - ESXi5.1 -Networking

Dear experts,
This is my post in this forum and I am trying to learn vmware esxi as much as possible. Sorry to ask you very basic questions.
I have created the following environments for learning purpose.I have a physical server (64 GB RAM) where  installed esxi 5.1 and created 4 VM machines with 8GB RAM on top of this. Each VMs has 2 Network ethernet cards. I have used the 4 vm as follows.
VM-1   for openfiler (storage)
VM-2   for another esxi host -1
VM-3  for  another esxi host -2
VM -4 for vCenter server
Now from vCenter server, I have added the hosts (VM-2, VM-3) in inventory and created another 2 VMs (nested vms)  on VM-2 host only and installed CentOS on these VMs. I have also configured a virtual standard switch on VM-2 (esxi host-1 above) so that two CentOS are able to connect each other over the virtual standard switch. But while trying to assign the IP address of CentOs , I am not seeing any hardware Ethernet available in CentOs and 'ifconfig -a ' command show 'veth0' instead 'eth0' . Is it happening because of Nested VM ? Is it my correct configuration ? If I am able to assign IP address in CentOS , can both OS communicate each other over the standard switch?
Thanks in advance.
Regards,
Tarun

Thank you for the reply.
I am able to assign IP address in Nested VMs through veth0 , but both the VMs are not pinging each other over the standard switch. Both VMs are in same server.
Am I missing some configuration ?
Thanks once again.
Regards,
Tarun

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