Broadcast Domain - Broadcast is a type of communication, where the sending device SEND a single copy of DATA and that copy of data will be delivered to every other device in the network segment. A Broadcast Domain consists of all the devices that will receive every broadcast packet originating from any device within the network segment. All PORTS on a hub or a SWITCH are by default in the same broadcast domain. All ports on a router are in the different broadcast domains and routers don't forward broadcast.

Collision Domain - is a network scenario where one particular device sends a packet on a network segment forcing every other device on that same segment to pay attention to it. At the same time, if a different device tries to transmit simultaneously, it will lead to a collision after which both devices must retransmit, one at a time. This situations is OFTEN in a hub environment, because each port on a hub is in the same collision domain. By contrast, Each port on a bridge, a switch or router is in a seperate collision domain.

Broadcast Domain - Broadcast is a type of communication, where the sending device send a single copy of data and that copy of data will be delivered to every other device in the network segment. A Broadcast Domain consists of all the devices that will receive every broadcast packet originating from any device within the network segment. All ports on a hub or a switch are by default in the same broadcast domain. All ports on a router are in the different broadcast domains and routers don't forward broadcast.

Collision Domain - is a network scenario where one particular device sends a packet on a network segment forcing every other device on that same segment to pay attention to it. At the same time, if a different device tries to transmit simultaneously, it will lead to a collision after which both devices must retransmit, one at a time. This situations is often in a hub environment, because each port on a hub is in the same collision domain. By contrast, Each port on a bridge, a switch or router is in a seperate collision domain.