Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 99
How does the RIB differ from the FIB?
Answer options
- A. The FIB maintains network topologies and routing tables. The RIB is a list of routes to particular network destinations.
- B. The FIB includes many routes to a single destination. The RIB is the best route to a single destination.
- C. The RIB is used to create network topologies and routing tables. The FIB is a list of routes to particular network destinations.
- D. The RIB includes many routes to the same destination prefix. The FIB contains only the best route.
Correct answer: D
Explanation
The correct answer, D, accurately describes that the RIB can hold several routes for a single destination prefix, while the FIB only retains the most optimal route. Options A and C incorrectly attribute routing table maintenance to the FIB. Option B misrepresents the roles of the RIB and FIB regarding route selection.