The routers get involved in this and they know that on the path between this router and that router a certain percentage of the bandwidth is reserved to these things and a certain percentage of it is allowed on a first come first served basis.
-- Jon Postel
   
Jon Postel   Name:
Jon Postel
Type:
Scientist
Nationality:
American
Birth:
August 6, 1943
Death:
October 16, 1998
https://www.nutquote.com/quote/Jon_Postel