The explosive growth of IP networking has let a genie out of the bottle. The more an organization or a nation is connected to the Internet, the more vulnerable it becomes. But the less it is connected, the less able it is to compete in our globalized economy. The challenge is finding the right balance between “can” and “should”: the fact that we can connect every person, every server, every app, and every cloud vs. the reality that we should control how applications and users communicate with each other.