A 911 PSAP runs DMVPN over dual underlays (MPLS and Internet) and must prefer MPLS when healthy. What design element correctly expresses that preference?
Select an answer to reveal the explanation.
Short Explanation
Two roads to the hub—MPLS and Internet—need a clear favorite. Separate tunnels or routing metrics that prefer MPLS keep 911 traffic on the private path until it really needs the public detour.
Full Explanation
Dual-transport DMVPN commonly uses multiple tunnels or differentiated metrics so overlay routing prefers the MPLS underlay and fails over to Internet. Preference is a routing/tunnel-design problem, not an STP root election on the underlay and not achieved by disabling NHRP on the preferred path. Static ARP for NBMA peers does not encode underlay preference policy.