Option A is correct. The RIB keeps all routing information received from peers, while the FIB keeps the minimum information necessary to make a forwarding decision.
In more detail, the RIB, also known as the routing table, contains all the routes learned from various routing protocols, connected networks, static routes etc. It’s used by the router to make the best path decisions.
On the other hand, the FIB, also known as the CEF (Cisco Express Forwarding) table in Cisco routers, contains a subset of the RIB routes that are used to make actual forwarding decisions in the data plane. It’s optimized for quick lookup, which is crucial for efficient packet forwarding.
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