一. IntServ 集成服務
二. DiffServ 區分服務（DS)
EF expedited fowarding 加速型轉發
三. Qos參數:帶寬, 延遲/延遲抖動, 分組丟失
sevice level agreement
granularity
Intserv is the architerture based on flow and state relatless,rely on the state and managemant of each flow.
DSCP differentiated services codepoint
PHB: BE(best effort),EF(expedited forwarding), AF(assured forwarding), CS(class seletor), LBE(lower best effort),EFD(expedited forwarding with dropping),PHB-I(interoperability PHB group)
PSGR packet scale rate guarantee
open course http://www.cocw.net/index.htm