These SoCs are often purpose built for networking. The CPU just connects to an internal switch chip instead of an external jack. Mikrotik makes block diagrams

These SoCs are often purpose built for networking. The CPU just connects to an internal switch chip instead of an external jack. Mikrotik makes block diagrams of some of their Routerboards available. This is a hAP AC3, for example https://i.mt.lv/cdn/product_files/RBD53iG-5HacD2HnD_201031.png https://i.mt.lv/cdn/product_files/RBD53iG-5HacD2HnD_201031.p... It runs on a Qualcom IPQ4019 single-chip Wi-Fi system-on-chip (SoC)