Which of the following is not a characteristic of Cisco Express Forwarding？（）
- AThe adjacency table is populated from a router’s ARP cache
- BCEF does not require the first packet of a data flow to be process switched
- CCEF maintains the Forward Information Base and the adjacency table
- DCEF can be enabled with the interface command ip cef
- EThe FIB is populated from a router’s IP routing table
- FOn most router platforms CEF is enabled by default