Difference Between a Switch and a Router ?

Switch as name it will switch your network... computers in the same subnet will communicate using switch..

router is a device by which computers in a diffrent network used to communicate. it wont allow to pass broadcast messages.where as switch will allow broadcast messages.

I would answer this question by taking reference from OSI Model.

• Hub - A hub is the least complicated device in networking. Hub can be considered a Layer 1 ( Physical ) device as its job is to transfer anything that comes in one port is sent out to the others. Therefore, every computer connected to the hub can sniff data to/from every other computer. Hub has no knowledge of data being transferred, its just an electrical signal.
• Switch - A switch works in a same way as Hub but little bit more efficient as it pays attention to the traffic that comes across it. It learns where where particular MAC addresses are. In a way switch works on Layer 2 (Data Link). Benefit of using a switch over a hub is that most of the network traffic only goes where it needs to rather than to every port (aka less packet congestion)
• Router - A router is the smartest and most complicated of the bunch. Router typically works on layer 3 (Network). Router can be programmed (like typical computers) to understand, manipulate, and route the packets. Moreover, these routers work are IP-Address aware as compared to switches which worked on MAC Addresses (easily spoofable)

HTH

Can u tell me the difference between a repeater and an amplifier? The net tech at work told me that a repeater doubles the distance between two network devices while the amplifier doubles the signal used by the repeater.Is this the correct definition? Explain, please.