Imagine 20 people standing in a line.
Classification:
You see that some people wear blue sweaters, and some white.
Marking:
You take a red brush, and stroke white sweaters with red color, and take a black brush, and stroke blue sweaters with black color.
Congestion management:
For every person that has red strokes on them, you allow two other people through that have black strokes on them
Congestion avoidance:
If there are more than 5 people with red strokes on them, kill one person
Policing:
If more that 6 people with black strokes try to enter at once, kill other people
Shaping:
If more that 6 people with black strokes try to enter at once, make other people wait until all people pass
Fragmenting:
If a person with red stroke weight more than 400 pounds, cut them in half
Interleaving:
If you want people with black strokes that weight 100 pounds to pass ahead of people with red strokes that weight 400 pounds, but it takes too long for large person to get through, you cut the large person in half, let one half pass, than let person with black stroke pass, than let the other half of a person with a red stroke pass, and connect two parts of that person into one again.
CoS is marking, but that's it.
For QoS to function, all other mechanisms have to be set up.
