The enterprise WAN has transitioned from dedicated TDM circuits with Frame Relay and ATM, to Packet-over-SONET and MPLS, and now to Ethernet-access services. However, two things have remained constant, WAN bandwidth is still expensive and provisioning WAN services can take a long time.
In addition, WANs have challenges with backup link utilization, security of remote sites, traffic engineering, Quality of Service (QoS), touchless provisioning, and traffic visibility. These issues and many business drivers are causing companies to re-evaluate their WAN design and deployment and look for opportunities for improvement.
Software-Defined WANs (SD-WAN) offer many advantages that make them compelling.
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