小乔 发表于 2021-8-11 10:18:57

【答题赢鸿鹄币】QoS

QUESTION 109
An engineer is describing QoS to a client. Which two facts apply to traffic policing? (Choose two)
A. Policing adapts to network congestion by queuing excess traffic
B. Policing should be performed as close to the destination as possible
C. Policing drops traffic that exceeds the defined rate
D. Policing typically delays the traffic, rather than drops it
E. Policing should be performed as close to the source as possible

选详细解释给予20鸿鹄币奖励

sunnorth 发表于 2021-8-11 10:18:58

A. Policing adapts to network congestion by queuing excess traffic
    policing 不使用队列机制，shaping使用队列
B. Policing should be performed as close to the destination as possible
    policing应靠近源,避免无用流量进入核心网络
C. Policing drops traffic that exceeds the defined rate
    对，policing 目的是drop超过CIR速率的流量，shaping 是尽量缓冲超过的流量
D. Policing typically delays the traffic, rather than drops it
   错，这说的是shaping，缓冲流量尽量不丢包，但会产生延迟、抖动
E. Policing should be performed as close to the source as possible
    对，policing 应尽量靠近源，避免无效流量进入网络

答案 CE

克里斯托夫 发表于 2021-8-11 12:20:16

C. Policing drops traffic that exceeds the defined rate
E. Policing should be performed as close to the source as possible

pkuio 发表于 2021-8-11 14:20:27


QUESTION 109
An engineer is describing QoS to a client. Which two facts apply to traffic policing? (Choose two)
A. Policing adapts to network congestion by queuing excess traffic-这是queuing，跟policing没有冲突
B. Policing should be performed as close to the destination as possible - 这浪费了网络资源
C. Policing drops traffic that exceeds the defined rate - 这是Policing的特性 V
D. Policing typically delays the traffic, rather than drops it - 这是traffic shaping 的特性
E. Policing should be performed as close to the source as possible - 这不浪费网络资源 V
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