Which statement about Cisco Express Forwarding’s (CEF’s) default operations is true?

A.
CEF is enabled by default on all Cisco routers.

B.
CEF’s default operation are router dependent.

C.
CEF is disabled by default on all Cisco routers.

D.
CEF is enabled at a global level, but is disabled at an interface level.

Explanation:

To enable CEF on the route processor card, use the ip cef global command in global configuration mode. To disable CEF, use the no form of this command:
– ip cef [distributed]
– no ip cef [distributed]
To enable CEF operation on an interface after the CEF operation has been disabled, use the ip route-chache cef command in interface configuration mode. To disable CEF operation on an interface, use the no form of this command. Reference: Cisco Press – Implementing CISCO MPLS study guide v2.0