How does the RIB differ from the FIB?
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Correct answer: The RIB can include multiple routes to the same prefix; the FIB contains only the best route..
Why this is the answer
The Routing Information Base (RIB) stores all routing information learned from various routing protocols and static configurations, potentially including multiple paths to the same destination prefix. This allows the router to have a comprehensive view of all available routes. The Forwarding Information Base (FIB), on the other hand, is derived from the RIB and contains only the best path for each destination prefix, as determined by the routing table's administrative distance and metric. The FIB is optimized for fast packet forwarding, often implemented in hardware (ASICs), while the RIB is a software-based control plane component. Therefore, the RIB holds all potential routes, and the FIB holds the actively used, best routes for forwarding.
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