How are the Cisco Express Forwarding table and the FIB related to each other?
- A. Cisco Express Forwarding uses a FIB to make IP destination prefix-based switching decisions correct
- B. The FIB is used to populate the Cisco Express Forwarding table
- C. There can be only one FIB but multiple Cisco Express Forwarding tables on IOS devices
- D. The Cisco Express Forwarding table allows route lookups to be forwarded to the route processor for processing before they are sent to the FIB
Explanation: The Forwarding Information Base (FIB) table – CEF uses a FIB to make IP destination prefix basedswitching decisions. The FIB is conceptually similar to a routing table or information base. It maintains a mirror image of the forwarding information contained in the IP routing table. When routing or topology changes occur in the network, the IP routing table is updated, and these changes are reflected in the FIB. The FIB maintains next-hop address information based on the information in the IP routing table.
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