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Question 4

Which statement about Cisco Express Forwarding is true?

The CPU of a router becomes directly involved with packet-switching decisions.

It uses a fast cache that is maintained in a router data plane.

It maintains two tables in the data plane: the FIB and adjacency table.

It makes forwarding decisions by a process that is scheduled through the IOS scheduler.

Correct Answer: C

Cisco Express Forwarding (CEF) maintains two tables in the data plane: the Forwarding Information Base (FIB) and the adjacency table. The FIB is used to make IP destination prefix-based switching decisions, while the adjacency table maintains the layer 2 next-hop information necessary for packet forwarding. This design allows CEF to improve the efficiency and speed of packet forwarding by pre-computing the necessary information and storing it in these tables.

Discussion

DJOHNROption: C

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

hku68

Yes. Thanks DJOHNR for explanation.

em6868

Thanks man!

Dumpsvibe_com_examsOption: C

My answer is C is rite

SeMo0o0oOption: C

C is correct

andy_doesnt_like_uucpOption: C

"C" "B" is rather fast switching relevant

vava_examOption: C

answer C

ciscokoolaidOption: 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/

nushaduOption: C

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 ...

AsymptoteOption: C

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.

cloud29Option: C

C is correct

Pudu_vladOption: C

The answer is C.

flash007Option: C

cef has 2 tables the fib and the adjacency table

AldebeerOption: D

This will be executed in control plane rather than in data plane . Right ?

LittleMingOption: C

The answer is C

Exam_khanOption: C

cef components are 2 tables. fib table and the adjacency table

CiscoDudeeeOption: C

CEF utilises the adjacency table and forwarding information base (FIB). C is the correct answer.