Sun's Pattern-based Design Framework: The Service Delivery Network 
by Jason Carolan and Mikael Lofstrand
September, 2005
The Service Delivery Network (SDN) is the approach that Sun uses to design service optimized network architectures for customer and in-house implementations. This approach consists of basic network building blocks, common network design patterns, integrated network components, and industry best practices that together are carefully blended in response to a customer's business and technical goals. The SDN provides a set of network connectivity, routing, load balancing, and advanced security mechanisms that, when applied in combination, result in flexible network infrastructure designs that provide high performance, scalability, availability, security, flexibility, and manageability.
The primary goal of the SDN is simple:
Service delivery at any time, from anywhere, to any device.
A service optimized network architecture focuses on the services provided over the network to the end user, rather than the enabling technologies or their related components. By virtualizing resources and understanding the core services offered directly to end users, as well as the other data center services that support these end user services, organizations can take advantage of a true service-driven architecture.
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