router - device that handles the connection between two or more networks
port - device that enables the connection of computer hardware
network security system that
firewall - prevents access by unauthorized user
packet - small amount of data sent over a network
backbone - the path of data transmission on a network
topology - the physical layout of a computer network
hub - device that connects the nodes on a network
virus - a piece of software code that infects, destroys, or disrupts computer functioning