What is the function of a service graph in SD-WAN orchestration?

• A. The sequence of policy actions applied to traffic
• B. A log of traffic events
• C. The policy enforcement engine at the edge
• D. A device inventory

Answer: (A)

In SD-WAN orchestration, a service graph expresses the sequence and combination of services that traffic should pass through as it moves through the network. It tells the controller the order in which policy actions and service functions (like firewall, DPI, NAT, QoS, encryption) are applied to different traffic flows, and how these services are chained across the path chosen for that traffic. This makes it possible to consistently deploy and enforce complex service chains across all edge devices.

It’s not a log of traffic events (which would be monitoring data), nor the policy enforcement engine at the edge (a runtime component), nor a device inventory (an asset listing). The service graph is the modeled plan of how services are applied to traffic.