Transmission medium is a branching cable with no closed loops. Tree layout begins at a point called the headend. A transmission from any station propagates throughout the medium and can be received by all other stations. C. Star Topology each station is connected directly to a common central node. Each station attaches to a central node, called a star coupler.
Ring is appropriate for very high speed links over considerable distances.
Star - best for short distances and can support a small number of devices at very high data rates. Twisted pair, coaxial cable, and optical fiber all used. A. Baseband Bus uses digital signaling, transmits signals without modulation. Can extend only a limited distance - l km. Repeaters can extend length of the network.