The diagram below shows a sample deployment of a traditional 3-tier applicaton consisting of a frontend in web-tier, a business application in business-tier and a backend in db-tier. The frontend service is exposed as a route as frontend.ext.appa12.tsi-af.de.
This service frontend is accessible via this route from the internet. The frontend pod itself accesses the service business via the exposed route business.app.int.appa12.tsi-af.de. Note that this route is not acessible from the internet directly. The business pod itself accesses the backend in db-tier via the service backend which is connected to the host directly with a so called Node port.
The service backend is accessible via vmapgrouterdb10n1.appa12.tsi-af.de:30061.