Few people in the world would disagree that a network firewall is an essential component for any size datacenter. In fact, operating without one could be considered by many to be network asset suicide! But adding a firewall to an existing datacenter is by no means a trivial task. In fact, the amount of work that would be required to re-cable every physical interface to properly tie it in with the rest of the network is enough to make many network administrators think twice about just how badly they really need that shiny new firewall, versus just sticking with what they have. Add to that the additional rack space, power, cooling, and management required by the new device, and some serious ROI questions may be raised.