Switch is a data link layer device that connect multiple LAN segments to form

a single network segment. In switch when we transmit the data first it examine

the data packets for source and destination, then the switch forward the data

packet to the appropriate destination.

Switch minimize the possibility of collision of data packets by reducing

collision domains.

Collision domain are the network segment between two network devices, when

the two devices transmit a data at a time then collision will occur. In such

case both the device stop working. Then it starts to work for a specific period

of time and retransmit the data.

Switches reduces the collision using micro-segmentation.