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At which layer does Cisco Express Forwarding use adjacency tables to populate addressing information?
Correct Answer: C
Explanation/Reference: Explanation: Adjacency table - Nodes in the network are said to be adjacent if they can reach each other with a single hop across a link layer. In addition to the FIB, CEF uses adjacency tables to prepend Layer 2 addressing information. The adjacency table maintains Layer 2 next-hop addresses for all FIB entries. References: http://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/47321-ciscoef.html