Which term refers to an underlay that serves as a backup to another UCS?

• A. SWVC Endpoint List
• B. Backup UCS
• C. SWVC List of Policies
• D. SWVC Service Uptime Objective Service Attribute

Answer: (B)

In SD-WAN terminology, the underlay transport that is kept ready to take over if the primary underlay fails is called a Backup UCS. It represents an alternate Underlay Connectivity Service that provides resilience for the overlay by stepping in when the main UCS becomes unavailable, helping to maintain connectivity and meet service requirements without manual intervention.

Other terms here refer to different aspects of the service: an Endpoint List is about which devices participate, a List of Policies covers traffic rules, and a Service Uptime Objective attribute relates to SLA-like metrics rather than the actual backup underlay.