Some more difference between single collision domain and broadcast domain?
A collision domain is a logical network segment where data
packets can "collide" with one another for being sent on a shared
medium, in particular in the Ethernet networking protocol. This is
an Ethernet term used to describe a network scenario wherein one
particular device sends a packet on a network segment, forcing
every other device on that same segment to pay attention to it.
A broadcast domain is a logical network segment in which any
computer or other device connected to the network can directly
transmit to any other on the domain without having to go through a
routing device, provided that they share the same subnet address
and are in the same VLAN, default or installed.
More specifically, a broadcast domain is the area of the
computer network composed of all the computers and networking
devices that can be reached by sending a frame to the data link
layer broadcast address.
A very basic network that uses hubs rather than switches or
routers is like a post office clerk checking the mail. One clerk
looks at each letter to confirm that the mail is not for
themselves.