Hub is a Physical layer devices that are really just multiple port repeaters. When an electronic digitalsignal is received on a port, the signal is reamplified or regenerated and forwarded out allsegments except the segment from which the signal was received. switch

(1) In networking, a device responsible for multiple functions such as filtering, flooding,and sending frames. It works using the destination address of individual frames. Switches operateat the Data Link layer of the OSI model.

(2) Broadly, any electronic/mechanical device allowingconnections to be established as needed and terminated if no longer necessary.