Reducing the collision domain size can be the result of installing network devices (usually switches and/or network bridges) that use microsegmentation.
Unlike network hubs and regular repeaters that usually broadcast every single packet, LAN switches are able to filter and forward packets by their MAC address (Media Access Control). The switch basically reads the 48-bit MAC address from the network card and is able to filter or stop frames inside the LAN or a certain network domain....
A computer network can be segmented physically but also logically. A collision domain is one of the logical network segments in which the data packets can collide to each other. One of the most common protocols used when referring to a collision domain is the Ethernet protocol. Collision domains are often referred as ‘Ethernet segments’.
The term of ‘collision domain’ is also used when describing the circumstances in which a single network device sends packets throughout a network segment and forces every other device in that network segment to pay attention to those packets....