This chapter explains quality of service (QoS) and the service models that embody it. It also suggests benefits you can gain from implementing Cisco IOS QoS in your network. Then it trains a closer focus on the Cisco Internetwork Operating System (IOS) QoS features and the technologies that implement them.
QoS refers to the ability of a network to provide better service to selected network traffic over various underlying technologies, including Frame Relay, Asynchronous Transfer Mode (ATM), Ethernet and 802.1 networks, SONET, and IP-routed networks. In particular, QoS features provide better and more predictable network service by
Supporting dedicated bandwidth
Improving loss characteristics