How do the RIB and FIB differ?
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Correct answer: The RIB stores all routing information learned from peers; the FIB stores only the minimal forwarding entries used to make forwarding decisions..
Why this is the answer
The Routing Information Base (RIB) is the router's complete routing table, containing all learned routes from various routing protocols (e.g., OSPF, EIGRP, BGP) and static configurations. It's a comprehensive database of network paths. The Forwarding Information Base (FIB), on the other hand, is a streamlined subset of the RIB, optimized for fast packet forwarding. It contains the essential next-hop information and associated Layer 2 rewrite instructions needed by the data plane to quickly forward packets without consulting the full RIB for every packet. Incorrect options: The RIB operates in the control plane, and the FIB operates in the data plane. The FIB contains forwarding entries, and the RIB contains routing prefixes. The RIB contains the Layer 2 and Layer 3 information, while the FIB contains the optimized forwarding entries. The RIB is the routing table, and the FIB is the CEF table.
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