The correct answer is All of these.Connecting device:Devices that are used to connect other devices are called connecting devices.There are 4 types of connecting devices.Repeater: A repeater is a device that receives signals and before it becomes too weak or corrupted the repeater regenerates the original bit pattern and sends the data.It is like a refreshing station for data while travelling.Hub:A hub is a multiport repeater.A hub can connect more than two segments of a LAN where a repeater can connect only two segments.It also does not have any filtering capabilities like a repeater.Bridge:A bridge operates in both the physical layer and the data link layer.As a physical layer device, it can regenerate bits and as a data link layer device, it can check the physical addresses contained in the frame.Bits can be carried to any distance by using properly spaced repeaters but the collision domain will not allow this and thats why brides are required.Router:A router is a three-layer device; physical, data link and network layer.As a physical layer device, it can regenerate a bit, as a data link layer device the router can check the physical addresses contained in a packet and as a network layer device, it can check the network layer addresses (addresses in IP layer).Additional InformationConnecting devices are bridges between the different parts of a document that tie all of the pieces together into one coherent package.Connecting devices show the reader how various sections of information are related, and they help keep the reader on track with the flow of information.Documents which do not include connecting devices are disjointed, choppy and difficult to read.Connecting devices are analogous to the traffic signals people rely on when driving.Imagine a major metropolitan area, such as Seattle, without bridges, traffic signs or traffic lights to guide drivers through traffic.The same is true of a document that lacks connecting devices: the reader will have a difficult time following the writer's train of thought and the document will not flow smoothly.