What are the reasonable expectations as to what a VPN can do to protect an organization's network and proprietary information?

Any employee who works in information technology is vulnerable to becoming enamored with the technology and the problems it solves. This can potentially blind you to some of the technology's shortcomings. Business leaders depend on their IT staff to provide realistic assessments of how the technology performs, the problems it solves, and the threats it can protect them against. When asked this type of question, you should provide a realistic example of what a VPN can do. The interviewer will immediately recognize if you're trying to oversell the solution.