Cisco Viptela SD-WAN uses an overlay network architecture to connect geographically distributed sites securely and efficiently. This architecture separates the physical transport network (underlay) from the virtual network (overlay), enabling flexibility, scalability, and centralized control. The overlay network consists of secure tunnels that link sites across various transport types like MPLS, broadband, LTE, or satellite, forming a unified and secure SD-WAN fabric.
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