(Cont.)Lackofbandwidth(有限的带宽):-to-enddelay(端到端延迟):(延迟的变化—抖动):Sometimesthereisalotofothertraffic,(数据包的丢失):(解决带宽不足)pressionmechanisms,theavailablebandwidthcanbeusedinamuchmoreefficientway:Voice:pressionInteractivetraffic:pressionEnd-to-EndDelayTypesofDelayProcessingdelay(处理延迟):Thetimeittakesforaroutertotakethepacketfromaninputinterface,examineit,(队列延迟):(串行化延迟):Thetimeittakestoplacethe“bitsonthewire.”Propagationdelay(传播延迟):Thetimeittakesforthepackettocrossthelinkfromoneendtotheother.
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