The internet is commonly visualized as a web—nodes connected in a mesh, each reachable from any other through multiple paths. This mental model is comforting but misleading. In practice, internet traffic follows an inverted tree: global flows converge toward a small number of hub regions and then branch into local paths on the return journey.
The Euro Packet Tree. Consider a typical request from Tallinn to a service hosted in the United States. The packet exits the local ISP, transits through Nordic exchange points, converges at AMS-IX in Amsterdam, crosses the Atlantic via a handful of submarine cables, and arrives at a U.S. peering point—most likely in the New York or Ashburn area. The return path follows the same trunk in reverse, then branches into the appropriate regional path.
This inverted tree topology is not an accident. It reflects economic reality: submarine cables and major exchange points are expensive infrastructure. Traffic consolidates at these chokepoints because that is where the capacity exists.
Implications for system design. Understanding this topology changes how you architect for performance. If most of your users are in Europe and your origin servers are in the U.S., the transatlantic hop is the dominant latency factor. No amount of application-level optimization will compensate for a 70ms round-trip that occurs on every request.
The practical response is to place processing as close to the user as the inverted tree allows. For European users, this means hosting within the AMS-IX catchment area or, better, within regional IX points like LINX (London), DE-CIX (Frankfurt), or MSK-IX (Moscow) depending on your user distribution.
Compliance and data residency. EU procurement frameworks increasingly specify data residency requirements. The inverted tree model makes compliance straightforward: keep the data within the European branch of the tree. A cache layer in Amsterdam or Frankfurt satisfies both latency goals and TED procurement data locality requirements, without needing to route traffic across the Atlantic.
For organizations also serving U.S. government clients through SAM.gov, the same principle applies in reverse: maintain U.S.-origin infrastructure for federal workloads and European-origin infrastructure for EU workloads. The inverted tree makes this natural rather than contrived.