Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 631

What is one difference between the RIB and the FIB?

Answer options

• A. The RIB keeps all routing information received from peers, and the FIB keeps the minimum information necessary to make a forwarding decision.
• B. The RIB works at the data plane, and the FIB works at the control plane.
• C. The FIB contains routing prefixes, and the RIB contains the Layer 2 and Layer 3 information necessary to make a forwarding decision.
• D. The RIB is known as the CEF table, and the FIB is known as the routing table.

Correct answer: A

Explanation

The correct answer is A because the RIB (Routing Information Base) stores all routing information from various sources, while the FIB (Forwarding Information Base) contains only the minimal data required for efficient packet forwarding. Options B, C, and D are incorrect as they mischaracterize the functions and definitions of RIB and FIB.