Cisco network service architecture, designing, CCDA, CCDP, ARCH 642-874, IT professional, male, 35yo, wearing glasses, short brown hair, blue shirt, black trousers, sitting, desk, office, computer screen, keyboard, mouse, network diagrams, routers, switches, servers, cables, fiber optics, data center, cloud computing, virtualization, cybersecurity, firewalls, VPN, Wi-Fi, Ethernet, LAN, WAN, network topology, infrastructure, architecture, blueprint, diagram, 3D visualization, close-up, low-angle shot, soft lighting, professional atmosphere.