Question:
Which feature builds a FIB and an adjacency table to expedite packet forwarding?
- cut through
- fast switching
- process switching
- Cisco Express Forwarding
Explanation: Cisco Express Forwarding (CEF) provides the ability to switch packets through a device in a very quick and efficient way while also keeping the load on the router’s processor low. CEF is made up of two different main components: the Forwarding Information Base (FIB) and the Adjacency Table. These are automatically updated at the same time as the routing table.
The Forwarding Information Base (FIB) contains destination reachability information as well as next hop information. This information is then used by the router to make forwarding decisions. The FIB allows for very efficient and easy lookups.
The adjacency table is tasked with maintaining the layer 2 next-hop information for the FIB.
Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps
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