H12-821_V1.0 · Question #867
The router directly guides the forwarding of data according to the FIB forwarding table.
The correct answer is A. TRUE. A is correct because the FIB (Forwarding Information Base) is the optimized data structure that the router's forwarding engine directly consults - packet-by-packet, in the data plane - to determine the outgoing interface and next hop for each arriving packet. The FIB is…
Question
Options
- ATRUE
- BFALSE
How the community answered
(54 responses)- A70% (38)
- B30% (16)
Explanation
A is correct because the FIB (Forwarding Information Base) is the optimized data structure that the router's forwarding engine directly consults - packet-by-packet, in the data plane - to determine the outgoing interface and next hop for each arriving packet. The FIB is pre-computed from the routing table (RIB) so that lookups are fast and can happen at line rate without invoking complex routing logic each time.
B (FALSE) is wrong because it would imply the router uses something other than the FIB for actual forwarding - such as the RIB or routing protocols directly - but those operate in the control plane and are not consulted per-packet. The whole point of the FIB is to be the single authoritative table the data plane uses.
Memory tip: Think of the acronym: FIB = Forwarding - the word "Forwarding" is literally in the name, signaling that this is the table directly responsible for forwarding decisions, not routing computation.
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