There are two types of connectivity in cloud computing: connectivity to the data center by the end-user, mainly over the Internet or VPNs; and between data centers, often over fixed SONET/SDH optical private lines, or “simple pipe.” This present mode of operation is inefficient and comes with high operating costs. This paper describes how an intelligent infrastructure can underlay the cloud for data center connectivity and bring this new operating model to a new level of performance, scalability, security, and operational efficiencies.