Most application stacks built today rely on decades-old security paradigm: individual components of the stack (web servers, app servers, database servers, authentication servers ...) are placed in different security zones implemented with separate physical devices, VLANs or some other virtual networking mechanism of your choice.
The security zones are then connected with one or more firewalls (when I was young we used routers with packet filters), resulting in a crunchy edge with squishy core architecture.
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