Which statement best describes the Cisco SD-WAN solution?

The Cisco SD-WAN solution is accurately described as a software-based overlay network that secures connectivity over any transport network. This means it can utilize a variety of underlying transport methods, such as broadband internet, MPLS, 4G/5G, or any other connectivity option available. The flexibility of a software-based approach allows organizations to take advantage of cost-effective internet links while still maintaining secure and optimized connectivity for their applications.

By using a software overlay, Cisco SD-WAN can intelligently manage traffic across multiple transport networks, applying policies to ensure optimal performance, reliability, and security. Advanced features such as application-aware routing, integrated security controls, and centralized management enable businesses to efficiently adapt to changes in network conditions and application requirements.

In contrast to the other options, suggesting that the solution is hardware-based would imply inflexibility and dependency on specific equipment, while stating it operates solely over MPLS networks would ignore its broader application capabilities. Claiming it only supports specific networking protocols overlooks its interoperability with various protocols and technologies inherent to a modern WAN. Thus, the comprehensive and adaptive nature of the Cisco SD-WAN solution is best captured by the description of it being a software-based overlay network.