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• CloudStack Networks
  • Management  - used by management nodes
  • Storage - used by secondary storage node
• VM Instance Networks 
  • Public - network used for VMs and Internet (used only if you do Isolated Mode)
  • Guest - network used for internal VM communication

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When you get to Setup Network, define your Physical Network Names, in my case I created 3 Physical Networks - as defined in Network Map above.

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Illustration above has 3 Physical Networks - as defined in Network Topology Map.

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Note: I took a shortcut in this demo, more appropriate way would have been to split vSwitch2-MGMTinto vSwitch2-Public and vSwitch2-MGMT and define 1 network for each respectively, making a total of 4 physical networks.

Screenshot shows how i've defined 2 Public Networks for DEV and MGMT. This is only required of your are using Isolated Mode in your Network Offering. To make an analogy of what Isolated mode means, look at how AWS does IaaS. They offer an Internal IP address as well as External IP address. If If you are planning to run your environment in traditional manner where NATing is handled by Firewalls, your don't need to define Public Network. Image Added
I've purposely left VLAN Range blank for both Physical Networks and will do this through API/CLI commands later. This function has not worked as expected through UI interface and Network has not been created. Image Added