Is there anything I should be aware of before setting up a virtual network?

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I've never done this before and tbh networks etc is something I'm not familiar with I'm going to setup a virtual network via this method

http://m.wikihow.com/Create-a-Virtual-Networks-by-Using-VMware-Workstation

Anything I should know before doing this? Possibly in terms of security? Im considering splitting it up an running the 4 vms on two separate machines if possible..

 

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What is it you are looking to do mate?