Modern business practices have extended users, endpoints, traffic and resources beyond the limits of the traditional network perimeter. To remain viable, therefore, today's security solutions must enable and extend business beyond that perimeter. Status quo proprietary solution vendors recommend complex--and often expensive--retrofitting of perimeter defenses, even though the modern network perimeter has become inherently insecure. Alternatively, a "clean VPN" scenario integrates secure remote access and network security appliance technology to deliver layered defense-in-depth protection for the core elements of business communications: the endpoints and users; the data and application resources; and the traffic connecting them.