Differences Between RIB and FIB
Question
What are two differences between the RIB and the FIB? (Choose two.)
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Explanations
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The RIB (Routing Information Base) and the FIB (Forwarding Information Base) are both databases used in routing protocols, but they serve different purposes.
RIB: The RIB is a database that is maintained by the routing protocol running on a router's control plane. It contains all the routing information learned by the router, including network topologies, routing policies, and other related information. The RIB contains both the learned routes and the best paths to reach them. The RIB's primary function is to maintain the router's routing table.
FIB: The FIB is a database that is maintained by the router's data plane. It contains a subset of the information stored in the RIB, specifically the forwarding information necessary to forward packets. The FIB contains a list of precomputed routes to all possible destinations, including next-hop IP addresses and the outgoing interface. The FIB is used to determine the best path for a packet and the egress interface to send it out.
Differences between the RIB and the FIB:
Derivation: The RIB is derived from the control plane, while the FIB is derived from the data plane. The control plane determines the best path to a destination, and the data plane uses that information to forward packets.
Functionality: The RIB contains all the routing information learned by the router, including network topologies, routing policies, and other related information. It maintains the routing table and updates it based on the information received from the routing protocol. On the other hand, the FIB only contains forwarding information necessary to forward packets, such as next-hop IP addresses and the outgoing interface.
In summary, the RIB and the FIB serve different functions in routing protocols. The RIB maintains the routing table and contains all the routing information learned by the router, while the FIB only contains forwarding information necessary to forward packets. The RIB is derived from the control plane, while the FIB is derived from the data plane.
