I have a computer repair business and am having alot of issues with infected computers that are brought in for service. We need to put them on the network in order for us to remove infections and clean them up. The problem is that I am getting blacklisted which is causing my Exchange server to not be able to send email. I am also getting reports that there are Trojans on my network. Well there are indeed infected machines on my network that are being cleaned up. Our environment is a handful of fileservers, domain controller, exchange server, cloud backup servers. We currently are using Verizon fios and there router they provide. We have 2 24 port gigabit switches as well. 1 static verizon IP. What would be the most cost effective way for us to separate the network so we have our domain computers on 1 network and the infected ones here for repair on another? Again, the infected machines also need internet access?