Keywords: Cisco, routers, switches, firewalls, SD-WAN, ISR, ASR, Catalyst, Nexus, ASA, Firepower, network engineering, data center, network infrastructure, network security, VPN, ACL, encryption, intrusion prevention, IDS, IPS, STIGs, RMF, NIST 800-53, TS/SCI, DoD, federal, compliance, network protocols, network monitoring, SolarWinds, Cisco Prime, performance optimization, troubleshooting, scalability, reliability, secure communications, technical documentation, configuration management, cross-functional collaboration, integration, cloud networking, AWS, Azure, hybrid networks, SDN, software-defined networking, technical leadership, mentorship, problem-solving, fast-paced, high-pressure, communication skills, stakeholder engagement, operational continuity, system performance, network assessments, technical SME, secure environments, project coordination, technical guidance. Responsibilities of the Cisco Network Engineer include: Architect, implement, and manage Cisco-based network infrastructures to support scalable, secure, and reliable data center expansions.