ABSTRACT
T oday's typical large organization manages multiple independent networks: each optimized to carry unique types of traffic: voice, data, and video. This may not be efficient but, until recently, may have been functional because the characteristics o f each traffic type made it incompatible with the others. This is quickly changing. Whereas in the past, applications contained only one type of traffic, today they combine voice, video, and data. Streaming media on alreadycongested LANs, or worse, WANs can make a network unusable.
