Common examples of bounded media are wire and optical fiber cables. Cable TV uses bounded media. Unbounded media transmit the data-carrying signal through space, independent of a cable. Broadcast radio and television are examples of unbounded media. When practical, cable represents a low-cost and reliable means of transmitting data between computing devices.
Practicality is a relative thing.
Certainly cables are likely to be the logical choice within a building or even a building complex. It may not be possible, however, to run a cable between two buildings on different sides of a public road, and it is certainly a major undertaking when the buildings are located on different continents. Such conditions may call for use of unbounded media. Bandwidth , the range of frequencies that the cable can accommodate. LANs generally carry data rates of 1 to 100 megabits per second and require moderately high bandwidth.