What is router,switch and hub?

Question

what is router,switch and hub?

whats the difference between them?

Answer 1

Starting with the simplest first.

A hub is a device that allows multiple devices to connect to a network. Each device shares the network and only can use it at a time - others have to back off until the network is idle.

A switch is a hub that gives each device sole access to their own network and switches between networks only when devices need to talk to each other. So devices A & B can communicate at the same time that devices C & D are communicating because the switch essentially keeps them on separate networks.

A router passes traffic between two networks as needed.

A home ADSL wireless router is generally a combination of all three devices - it is a hub for wireless devices, a switch for ethernet devices and a router for all connected devices allowing them to route their traffic from the local network onto another network (in this case the Internet)

Answer 2

Routers connect two or more logical subnets, which do not necessarily map one-to-one to the physical interfaces of the router.[1] The term layer 3 switch often is used interchangeably with router, but switch is really a general term without a rigorous technical definition. In marketing usage, it is generally optimized for Ethernet LAN interfaces and may not have other physical interface types.

A switch is a mechanical device used to connect and disconnect a circuit at will. Switches cover a wide range of types, from subminiature up to industrial plant switching megawatts of power on high voltage distribution lines.

A network hub or repeater hub is a device for connecting multiple twisted pair or fiber optic Ethernet devices together, making them act as a single network segment. Hubs work at the physical layer (layer 1) of the OSI model. The device is thus a form of multiport repeater. Repeater hubs also participate in collision detection, forwarding a jam signal to all ports if it detects a collision.

Answer 3

its share the computer to other computer via router  

hub is connecting multi computer with one its act as server it the difference