WAY in which a network is laid out physically. Two or more DEVICES connect to a link to form a topology.Mesh topology:In this, each DEVICE has a dedicated point to point link to every other device. Dedicated MEANS that a link carries traffic only between two devices it connects. It is the most RELIABLE topology.Star topology:In this, each device has a dedicated point to point link only to a central controller called a hub. Devices are not directly connected to each other. It does not allow direct traffic between devices. Each device needs only one link.Bus topology: It is multipoint. One long cable acts as a backbone to link all the devices in a network. Nodes are connected to the bus cable by drop lines and taps. Ring topology:In this, each device has a point to point connection with only two devices on either side of it. A signal is passed along the ring in one direction from device to device until it reaches its destination.Therefore Mesh Topology gives highest reliability