What are two correct distinctions between the RIB and the FIB? (Choose two.)
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Correct answer: The RIB stores routing prefixes and the FIB holds egress-interface forwarding information., The RIB originates in the control plane and the FIB is built from the RIB..
Why this is the answer
The Routing Information Base (RIB) is a control plane component that stores all known routes learned from various routing protocols (e.g., OSPF, EIGRP, BGP) and static configurations. It contains complete routing information, including administrative distance, metrics, and next-hop IP addresses. The Forwarding Information Base (FIB) is a data plane component derived from the RIB. It is optimized for fast packet forwarding and contains only the necessary information: destination prefixes and their corresponding egress interfaces, along with next-hop MAC addresses. Therefore, the RIB stores routing prefixes, and the FIB holds egress-interface forwarding information. The RIB originates in the control plane, and the FIB is built from the RIB to populate the data plane for efficient packet forwarding. Incorrect options: "The FIB is a database of prefixes and the RIB decides egress interfaces" is incorrect because the RIB stores prefixes and the FIB determines egress interfaces. "The FIB is derived from the data plane and the RIB is derived from the FIB" is incorrect because the FIB is derived from the RIB (control plane to data plane), not the other way around, and neither is derived from the data plane. "The FIB originates in the control plane and the RIB is derived from the FIB" is incorrect because the RIB originates in the control plane, and the FIB is derived from the RIB.
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