i Quality of Service It is not enough that networks work They must work we!∥ Quality of Service(Qos) defines quantitative measures of service quality peed S 速度 Delay( Latency 延迟 Reliability 可靠性 Security(not a Qos measure but crucial)9 Quality of Service • It is not enough that networks work – They must work well • Quality of Service (QoS) defines quantitative measures of service quality – Speed 速度 – Delay (Latency) 延迟 – Reliability 可靠性 • Security (not a QoS measure but crucial)