All this brings us to the issue that looking at any system as something that is inside one box or in one enclosed space is not enough to gain assurance about its security. The reality is
that nearly every computer in the world could be, and in most cases is, connected to every other computer through the Internet. The worldwide propagation of the (in)famous Nimda, Code Red and Lovebug viruses and worms are proof of this connectivity. Such connectivity has the propensity to provide access or communication paths for anyone to any system in the absence of any measures to prevent such access. Fortunately, a plethora of technical solutions, many of which have become standards, keeps most networks and systems segregated and protected.