well, address bus is still a bus. They share a bus not the addresses. From the programming point of view it is the same, from the architecture PoV the complexit

well, address bus is still a bus. They share a bus not the addresses. From the programming point of view it is the same, from the architecture PoV the complexity (number of gates and latency) it is not the same. A network stack is just a external universal bus that deals and introduces way more complexity. But it is just a bus.