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单选题
Which of the following is not a characteristic of fast switching？（）
A
Fast switching reducesa routers CPU utilization， compared to process switching
B
All packets of a flow， except for the first packet， use the information in the fast cache
C
It can be enabled with the interface command ip route-cache
D
Fast switching uses a fast cache maintained in a router’s control plane
E
The fast cache contains information about how traffic from different data flows should beforwarded
F
Even though the fast switching is enabled， the first packet of a flow is still process switched
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