A typical enterprise network topology has multiple local area networks (LANs) con nected by bridges or Layer 2 switches. Many times the different LANs are all of one type, typically wired Ethernet, but that is changing. Wireless networks are entering these hal lowed grounds. Furthermore, today’s networks are converging into a unique network infrastructure that is expected to carry data in the form of voice, video, and mission crit ical applications. These applications require a certain amount o f bandwidth in order to provide the end-user with a quality product, and that’s where Quality o f Service comes into play. The term “Quality of Service” (QoS) refers to the quality of network services. It is sort o f an umbrella term for all the related technologies that are put in place with the objective of providing QoS, so as to supply better network services in order to satisfy network applications’ bandwidth needs. QoS is not related to a specific technology or net work topology, but transparently crosses all networks-IP, Frame Relay, ATM, Ethernet, cellular, and Wi-Fi.