Two-tier architecture, networking, futuristic, modern, sleek, metallic, silver, glass, LED lights, wires, circuits, servers, routers, switches, CPUs, motherboards, data centers, cloud computing, virtualization, abstraction layer, application layer, physical layer, infrastructure, scalability, reliability, security, firewalls, intrusion detection systems, network topology, star topology, bus topology, ring topology, mesh topology, 3D composition, futuristic ambiance, neon lights, dark background, high-tech atmosphere.