General question setting up a virtual environment using one physical laptop

[Joaq33]

This is just a general question and may have been asked already, but I just need a little clarification. I am building out a virtual environment for my server 2012 r2 on my aspire v5-552p-8471 laptop. I am setting up pfsense to emulate the ISP side of the diagram. So my question is do I need more than 1 physical NIC in my laptop to make this work or will the integrated NIC in the laptop work? I have an image of the diagram, but it will not post here. I will much appreciate any assistance.

[n3by]

have a look here:

http://timita.org/wordpress/2011/08/01/protect-windows-with-pfsense-and-virtualbox-part-4-installing-and-configuring-pfsense-on-virtualbox/

http://pc-addicts.com/how-to-install-pfsense-in-virtualbox/