Knowledge of enterprise networking technologies, including firewalls, load balancers, intrusion detection systems/network intrusion detection systems (IDS/NIDS), network address translation (NAT), port address translation (PAT), virtual local area networks (VLANs), access control lists (ACLs), and cloud networking architectures. About BAE Systems Intelligence & Security BAE Systems, Inc. is the U.S. subsidiary of BAE Systems plc, an international defense, aerospace and security company which delivers a full range of products and services for air, land and naval forces, as well as advanced electronics, security, information technology solutions and customer support services.