Which Cisco SD-WAN transport preference feature dynamically reroutes applications when SLA thresholds are exceeded?

• A. Application-aware routing
• B. VTP pruning
• C. Root Guard
• D. DHCP snooping

Answer: (A)

Application-aware routing is the Cisco SD-WAN capability that handles transport preference by using per-application SLA metrics to choose the best path and automatically reroute when thresholds are exceeded. It continuously monitors metrics such as latency, jitter, packet loss, and available bandwidth for each application. If the current path fails to meet the application's SLA—for instance, latency or loss crosses defined thresholds—the system shifts traffic to an alternate transport that can satisfy the application's requirements. This dynamic, SLA-driven path selection across multiple transports (like MPLS, broadband, or cellular) is what ensures consistent application performance without manual intervention.

Other features mentioned operate in different areas: VTP pruning reduces unnecessary VLANs on switches, Root Guard protects against STP topology issues, and DHCP snooping prevents rogue DHCP servers. None of these manage application-level path performance or automatic rerouting based on SLA thresholds.