transmission media divided in to two types
guided unguided
Transmission Media: All network nodes (computers and peripherals) are connected to each other and to the network by transmission media. A transmission medium establishes a communications channel between the nodes on a network and can take several forms:
a. Networks can use existing wiring such as power lines
b. Networks canuse additional cable to connect nodes
c. Wireless networks use radio waves instead of wires or cable to connect nodes.