is a group of two or more computers or other electronic devices that are in for the purpose of exchanging data and sharing resources is a physical medium such as coaxial cable or optical fiber that can connec computers are two or more computers directly connected by some physical medium such a cable or optical fiber. is a node that is connected to two or more networks. It generally forwards one network to another. are the physical links that are limited to a pair of nodes. physical links that are shared by more than two nodes. is a digital process that can be applied whehthe data rate capacity of the medium is greater than the data rate required by the sending and receiving is the process of combining two or more data streams into a single physical