IN-LINE COGNITIVE NETWORK SECURITY PLUGIN DEVICE

Systems, methods, and computer program products providing network security leveraging analytics and physical separation between computer systems and a network to prevent threats from infecting network devices. A specialized pluggable dongle like security device is inserted between ports of computer system(s) connecting to the network and port(s) of network hardware facilitating connections between the computer system and computer network. The security device uses a combination of onboard analytics and cloud-based analytic services to detect incoming threats from network traffic and whether to allow network traffic to pass through the security device and/or prevent network traffic from entering the computer system. In response to detected network threats, an out of band management network communicating with the security device can open or close a physical gate onboard the security device, which, when opened introduces an air gap between the network and computer system, preventing harmful network traffic from entering the computer system.