Knowledge of network device configuration and troubleshooting (ideally, Cisco IOS/IOS-XE), IP subnetting and protocols such as BGP, OSPF and EIGRP, and advanced features like GRE, IPSEC, IP quality-of-service, VLANs, and multicast. The above salary range represents a general guideline; however, Northrop Grumman considers a number of factors when determining base salary offers such as the scope and responsibilities of the position and the candidate''s experience, education, skills and current market conditions.