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[Robert van Leeuwen <Robert.vanLeeuwen@xxxxxxxxxxxxx>]

>Imagining that nova creates that new instance in a different compute node, 
> how quantum/neutron deal's with connectivity? 

Not sure what you are asking exactly.
How connectivity between machines technically work depend on the configuration.
e.g. you can setup Neutron to use/configure vlan's on the physical network or use GRE tunnels.
Usually you can define a network within OpenStack and Neutron will handle setting up up the required components.

> I am reading a lot about Quantum /Neutron and i know that probably 
> I need to use a load balancer like Atlas-LB, etc...
Load-balancers are only needed when you scale out one application for regular communication between machines you won't need it.

Cheers,
Robert van Leeuwen