https://www.fir3net.com/Routers/Cisco/what-is-cef-cisco-express-forwarding.html
CEF is built around 2 main components - the Forwarding Information Base (FIB) and the Adjacency Table.
Answer, C
Correct Answer is C. CEF maintains two tables in the data plane: the FIB and adjacency table.
Answers A & D describe Process Switching and Fast Switching (when processing the first packet). B describes Fast Switching also known as Route Caching.
Source: http://www.patrickdenis.biz/blog/1-1-b-identify-cisco-express-forwarding-concepts/
C.
cisco#show adjacency
Protocol Interface Address
IP Ethernet0/0.10 192.168.255.1(7)
cisco#show ip cef
Prefix Next Hop Interface
0.0.0.0/0 no route
0.0.0.0/8 drop
...
C
Reference:
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/47321-ciscoef.html#:~:text=The%20Forwarding%20Information,all%20FIB%20entries.
CEF utilises the adjacency table and forwarding information base (FIB). C is the correct answer.
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