At which layer does Cisco Express Forwarding use adjacency tables to populateaddressing information?

At which layer does Cisco Express Forwarding use adjacency tables to populateaddressing information?
A . Layer4
B . Layer 2
C . Layer 1
D . Layer 3

View Answer

Answer: B

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

http://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/47321-ciscoef.html