what is the advantage of policing opposite to shaping？
正确答案:
（1）policing does not require extra memory， and it does not impose variable delay.But shaping requires memory for buffering excess traffic， which creates variable delay and jitter；
（2）Policing can re-mark traffic， but traffic shaping does not re-mark traffic.
（3）Policing can be applied to the inbound and outbound traffic （with respect to an interface）， but traffic shaping applies only to outbound traffic.
1.policing dost not require extra memory.
2.policing can remark traffic.
3.policing can be used to inbound and outbound traffic.shaping is used only in outbound.
（2）Policing can re-mark traffic， but traffic shaping does not re-mark traffic.
（3）Policing can be applied to the inbound and outbound traffic （with respect to an interface）， but traffic shaping applies only to outbound traffic.
1.policing dost not require extra memory.
2.policing can remark traffic.
3.policing can be used to inbound and outbound traffic.shaping is used only in outbound.
答案解析:有
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