The course covers principles of computer networks and network security design and operation. Principles of computer networks: requirements, connectivity levels, layered architectures, and applications. Direct link networks, packet switched networks, IP, and internetworking. Core perimeter security fundamentals and network security components. Layered security and defense in depth. Packet filtering, routers as security devices, intrusion detection systems, IPSec, and VPNs. Incident response, design fundamentals, and security assessments to maintain security posture.