Familiarity with zero-trust architecture, cross-domain solutions, network segmentation, secure transport, tunneling, overlay networks, mesh VPNs, traffic shaping, network obfuscation, anonymity, and low-signature infrastructure concepts. Strong experience with TCP/IP, routing, switching, VLANs, subnetting, DNS, DHCP, NAT, firewalls, VPNs, wireless networking, secure remote access, Linux networking, and command-line troubleshooting.