Required Experience & Expertise in the following areas : Experience supporting Cisco-based enterprise network infrastructure across core, distribution, access, and edge environments, including routing, switching, VLANs, VPNs, DNS/DHCP, firewall management, and performance optimization. Experience applying NIST SP 800-53 and NIST SP 800-207 concepts to network security controls, Zero Trust Architecture, segmentation, micro-segmentation, least-privilege access, identity-aware networking, and 802.1X network access control.