Cisco 100-105 Exam

Which feature automatically disables Cisco Express Forwarding when it is enabled?

  • A. multicast
  • B. IP redirects
  • C. RIB
  • D. ACL logging
Answer: Option D.
Explanation: 

If you enable Cisco Express Forwarding and then create an access list that uses the logkeyword, the packets that match the access list are not Cisco Express
Forwarding switched. They are process switched. Logging disables Cisco Express Forwarding.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipswitch_cef/configuration/12-4t/isw-cef-12-4t-book/isw-cef-enable-disable.html

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