Exam 350-401 topic 1 question 23 discussion

Provided answer is correct. Both the RIB and FIB contain network prefixes with egress interface listed. If you execute an “show ip cef” command to display the contents of the CEF table (FIB), you will see the CEF entries listing the egress interface. Additionally, if CEF is enabled, the FIB is used to make forwarding decisions – RIB table is not referenced at all to determine the egress interface.

C & D are correct

RIB is routing prefixes while FIB is from RIB therefore, C and D are the answers

C+D are the answers.

C + D are correct

C and D are correct

D is correct but, A and C both could be the answer, RIB operates at the control plane and FIB operates at the data plane, when FIB is enabled it takes a copy from the RIB. based on that I'm leaning toward C.

C and D are correct

C-D are correct

C-D are correct

C & D Router# show ip cef adjacency GigabitEthernet 3/0 172.20.26.29 Prefix Next Hop Interface 10.1.1.0/24 10.20.26.29 GigabitEthernet3/0 the interface is there in the adjacency table which is part of FIB and CEF

Also, the only table that has the egress interface is RIB and Adjacency Table. Not sure if you can term "FIB - a database of routing prefixes". IMO, it can be since, it does contain all the prefixes/length. If that's the case, i would pick A and D as the correct answer.

D is correct but there is a doubt re: C. Since, FIB doesn't have the information to choose the egress interface for each packet. Just the prefix/length and next-hop