In the figure below, three locations are shown. Tier-2 is the smaller site, needing only broadband connectivity. Tier-3 is the high-value campus/branch location, needing MPLS. Tier-4 is the high-value site, and it is a data center in this example. The black lines represent Layer 2 links, allowing the circuits to be physically terminated and logically connected directly to the VCEs.
Figure 6. Example of Dell Technologies SD-WAN network