Often customers or vendors will bring there laptops in and try to connect to the Internet. The problem is I am seldom told when this occurs and I would like to at least verify the laptop is not a threat before it is connected to the network. I have basics covered like disabling the guest account and I am aware they would not be part of the domain. But is there anything else I can do? I have looked at options like HP's Identitiy manager but it's very expensive and a little bit of overkill.