These are those that give a conduit from one machine to another that add twisted-pair, fiber-optic cable and coaxial cable. A signal traveling along any of these media is directed and is obtained by the physical limits of the transfer medium. Coaxial cable and twisted pair use metallic that transport and access signals in the form of electrical current. Optical fiber is a plastic or glass cable that transports and accepts signals in the form of wave. The term transmission medium also defines to a technical machine that employs the material substance to guide or transmit waves. Thus, a copper cable or an optical fiber is a transmission medium. Not only this but also is handling to guide the transmission of networks with guided transmission media, the waves are guided along a physical way.