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