Air is Single Collision and Broadcast domain.

When we speak in a group of ten people, we are in the same collision domain. If we refer to a single individual even though we are making other nine to listen, and also if two people speak at same time there is sound waves collision. This is the principle for tagging systems in a collision domain.

The set of computers where no two computers can send data simultaneously are said to be in same collision domain. As in the above paragraph explained air acts as the medium of single collision domain. We can say “that air acts like single collision domain for sound waves.”

One more interesting property of single collision domain is that an intentional unicast is made broadcast by the medium, as we see in the case discussed.

When we say “Gentlemen, may I have the attention please”, by prefixing gentlemen we make our speech a broadcast sound traffic. Sound wave reaches every person in same fashion. Conclusion is that Air is a single broadcast and single collision domain for sound waves.