Software as a service (SaaS) and cloud computing services are changing the face of branch office networking for large companies. Branch office networks used to comprise carrier IP networks put in place to provide workers in those offices with access to centralized corporate applications. Now those workers need access to both the enterprise data center and to cloud-based SaaS providers for cloud- hosted applications, requiring hybrid WANs that combine carrier networks and Internet access. Carriers are launching new services to meet these needs, but branch offices still face the issue of optimizing application performance for all end users regardless of location and proximity to the data center and to cloud service providers. The traditional approach in branch office networks has bee

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